Spring is in the air, and there’s nothing quite like the sweet-tart flavor of fresh rhubarb to brighten up your dessert table. That’s why I’m excited to share my rendition of the Icelandic Happy Marriage Cake, also known as Hjónabandssaela. This delightful cake features a buttery, crumbly oats and cardamom crust that perfectly complements the vibrant rhubarb filling. What I love most about this recipe is that it’s not only simple to whip up but also a guaranteed crowd-pleaser—ideal for celebrations or a cozy family get-together. Imagine serving this irresistible treat alongside a dollop of whipped cream, making it the perfect ending to any meal. Ready to elevate your spring baking game with this charming cake? Let’s dive in!

Why is this cake so special?
Delightful balance of flavors: The bright, sweet-tart rhubarb filling pairs beautifully with the warm notes of cardamom, creating a cake that’s simply unforgettable.
Simple to make: With just a handful of ingredients, this cake is incredibly easy to prepare—perfect for home bakers at any skill level.
Crowd-pleaser: Whether it’s a family gathering or a dinner party, this Icelandic Happy Marriage Cake is sure to impress your guests and leave them wanting more.
Versatility: Feel free to switch up the rhubarb with seasonal fruits like strawberries or apples for a refreshing twist or serve it alongside some whipped cream for an extra indulgent touch!
Satisfying texture: The crumbly oat crust adds a delightful crunch, making each bite a unique experience. You’ll love the way it contrasts with the soft, juicy rhubarb.
For other sweet treats, try my warm and comforting Cinnamon Apple Cake or the seasonal winner, Pumpkin Coffee Cake.
Ingredients for Icelandic Happy Marriage Cake
Elevate your baking with fresh flavors!
For the Rhubarb Compote
• Fresh Rhubarb – Provides tartness and natural sweetness; opt for pink for a beautiful contrast.
• Superfine/Caster Sugar – Essential for drawing out moisture while sweetening the compote; consider brown sugar for a richer flavor.
• Vanilla Extract – Enhances the overall flavor profile, making the rhubarb shine.
For the Crust
• Rolled Oats – Forms the base of your crust; avoid quick oats for the best texture.
• Plain/All-Purpose Flour – Creates a light structure in the crust and crumbles; ensure it’s properly sifted for consistency.
• Brown Sugar – Adds a deep flavor to the cake and activates the baking soda as it bakes.
• Ground Cardamom – Infuses warmth and aromatic flavors; don’t skip this for the authentic taste.
• Baking Soda – Key leavening agent; pair it with brown sugar for best results.
• Unsalted Butter – Adds richness and binds everything together; ensure it’s softened for mixing.
• Medium Egg – Binds ingredients while helping the cake rise for a wonderfully fluffy texture.
Now that you are familiar with the ingredients, let’s bring those flavors together in a delightful baking adventure!
Step‑by‑Step Instructions for Icelandic Happy Marriage Cake
Step 1: Prepare Rhubarb Compote
Line a 20 cm (8-inch) round cake tin with parchment paper to ensure easy removal later. In a medium saucepan, combine fresh rhubarb, superfine sugar, and vanilla extract. Cook over medium heat for about 15 minutes, stirring occasionally, until the rhubarb is soft but still holds its shape. Once done, set the compote aside to cool while you prepare the cake crust.
Step 2: Make Cake Crust
Preheat your oven to 200°C (400°F) to get the temperature just right for baking. Using a food processor, blend rolled oats until they reach a slightly finer texture. In a mixing bowl, combine the oats, plain flour, brown sugar, ground cardamom, and baking soda. Cut in the softened unsalted butter until it resembles coarse crumbs, then mix in a medium egg until you form wet clumps ready for pressing.
Step 3: Assemble and Bake
Press about two-thirds of the dough mixture into the prepared cake tin, ensuring it covers both the base and the sides evenly. Spoon the cooled rhubarb compote onto the crust, spreading it evenly to maximize flavor in every bite. Take the remaining dough and crumble it over the top, creating clumps for a delightful finish. Bake for approximately 25 minutes, or until the crust is golden and crisp, filling your kitchen with delicious aromas.
Step 4: Cool and Serve
Once baked, remove the Icelandic Happy Marriage Cake from the oven and let it cool in the tin for a few minutes. Carefully transfer it to a wire rack to cool completely, which helps maintain its texture. After cooling, slice and serve with a dollop of whipped cream for an indulgent touch, making this delightful dessert a perfect ending to any meal.

Expert Tips for Icelandic Happy Marriage Cake
• Fresh Rhubarb: Ensure your rhubarb is firm and vibrant. Overcooked rhubarb can turn mushy, losing its delightful texture.
• Sugar Measurement: Be precise when measuring sugar; even slight adjustments can significantly alter the taste and sweetness of the filling.
• Consistent Crust: Avoid using quick oats or steel-cut oats for your crust; rolled oats create the ideal texture for a crumbly base in this Icelandic Happy Marriage Cake.
• Baking Time: Keep an eye on the cake as it bakes. Oven temperatures can vary, so check for a golden finish to achieve the best result.
• Storage: If you have leftovers, store them in an airtight container. They’ll remain fresh for up to three days, ensuring you enjoy this treat a little longer!
Make Ahead Options
Planning ahead with the Icelandic Happy Marriage Cake can save precious time, especially during busy weeks! You can prepare the rhubarb compote up to 3 days in advance, simply store it in an airtight container in the refrigerator to keep its vibrant flavor intact. For the crust, you can mix the dry ingredients and keep them in the fridge for up to 24 hours before use to maintain freshness. When you’re ready to bake, just add the softened butter and egg to the dry mixture, press into the tin, and layer with the chilled compote. This way, you’ll have a delicious cake ready with minimal effort while still tasting just as delightful as when freshly made!
What to Serve with Icelandic Happy Marriage Cake
Springtime indulgence just got sweeter with delightful pairings!
- Whipped Cream: A dollop of freshly whipped cream adds a light, airy contrast to the cake’s crumbly texture, enhancing its sweetness.
- Vanilla Ice Cream: This classic pairing brings a creamy chill that complements the warm notes of cardamom beautifully, making every bite a dream.
- Fresh Berries: Juicy strawberries or tart raspberries offer a fresh burst of flavor, balancing the rich rhubarb filling with their natural sweetness.
- Mint Tea: The refreshing notes of mint tea cleanse the palate, allowing the cake’s flavors to shine while providing a soothing end to your meal.
- Almond Biscotti: Crunchy and nutty, biscotti offers a satisfying texture that pairs well with both tea and the moist cake, creating a delightful contrast.
- Coffee: A robust cup of coffee serves as the perfect counterpart, enhancing the warm spices in the cake while perfecting your afternoon treat.
Each of these suggestions elevates your Icelandic Happy Marriage Cake experience, turning a simple dessert into a cherished occasion.
Icelandic Happy Marriage Cake Variations
Feel free to dabble with these delightful variations and make the Icelandic Happy Marriage Cake your own!
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Berry Blast: Substitute rhubarb with a mix of strawberries and blueberries for a burst of fruity flavor. The sweetness of the berries creates a vibrant update to this classic cake.
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Whole Wheat Flour: Replace all-purpose flour with whole wheat for a nuttier taste and added health benefits. This swap enhances the texture while keeping it wholesome.
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Nutty Crunch: Add finely chopped almonds or walnuts to the crust. This will introduce a lovely crunch that nicely complements the soft, sweet filling.
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Spicy Kick: Sprinkle in some cinnamon or nutmeg along with cardamom to enhance the warmth of the cake. These spices will bring an extra layer of flavor that’s simply irresistible.
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Gluten-Free: Use gluten-free flour in place of all-purpose flour. This versatile swap allows everyone to enjoy this treat, ensuring nobody feels left out at the dessert table.
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Dairy-Free: Substitute unsalted butter with coconut oil or a non-dairy butter alternative. The result will be a cake that is just as rich and moist, without any dairy.
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Tropical Twist: Try replacing rhubarb with diced mango or pineapple. This refreshing variation brings a tropical flair that will transport you straight to an island paradise!
For a cozy spring experience, I also recommend treating yourself to my delicious Cinnamon Apple Cake or seasonal Pumpkin Coffee Cake.
Storage Tips for Icelandic Happy Marriage Cake
Room Temperature: Store the cake in an airtight container at room temperature for up to 3 days to maintain its delicious texture and flavor.
Fridge: If you want to keep it longer, refrigerate the cake for up to a week. Remember to cover it well to prevent it from absorbing other odors.
Freezer: Wrap individual slices tightly in plastic wrap and then foil, storing them in the freezer for up to 2 months. Thaw at room temperature before serving for the best taste.
Reheating: If you prefer a warm slice, reheat in the oven at 180°C (350°F) for about 10 minutes, allowing the crust to crisp back up while warming the rhubarb filling. Enjoy your Icelandic Happy Marriage Cake!

Icelandic Happy Marriage Cake Recipe FAQs
How do I select ripe rhubarb for my cake?
Absolutely! When selecting rhubarb, look for firm, brightly colored stalks—pink or green will work. Avoid any that have dark spots or wilting leaves, as these are signs of overripeness. Fresh rhubarb should feel crisp and not too soft, as this means it’s at its peak for making your delicious Icelandic Happy Marriage Cake!
How should I store leftover Icelandic Happy Marriage Cake?
To store your cake, keep it in an airtight container at room temperature for up to 3 days. For longer freshness, place it in the refrigerator where it can last up to a week. Always ensure it’s covered well to prevent it from absorbing other flavors. The key is to keep that delightful texture intact for your next slice!
Can I freeze slices of Icelandic Happy Marriage Cake?
Yes, you can! For freezing, wrap individual slices tightly in plastic wrap, then wrap them in aluminum foil to prevent freezer burn. Store in the freezer for up to 2 months. When you’re ready to enjoy a slice, simply thaw it at room temperature or reheat it in a preheated oven at 180°C (350°F) for about 10 minutes for that fresh-baked goodness.
What should I do if my cake doesn’t rise as expected?
Very! If your cake doesn’t rise, it might be due to a couple of reasons. First, check that your baking soda is fresh—old baking soda loses its potency and won’t help your cake rise. Secondly, ensure you’re measuring your ingredients accurately, particularly the brown sugar, which interacts with the baking soda. If you notice your dough is too crumbly before pressing it into the tin, adding a touch more egg can help bind it better.
Are there any dietary considerations for this cake?
Absolutely! For those with allergies, ensure you’re aware that this Icelandic Happy Marriage Cake contains gluten and dairy. If you’re catering to gluten-sensitive diets, consider using a gluten-free flour blend in place of all-purpose flour. For vegan options, replace the unsalted butter with a plant-based butter alternative and the medium egg with a flaxseed egg. Simply mix one tablespoon of ground flaxseed with two and a half tablespoons of water, letting it sit until it thickens—this works beautifully as a binding agent!

Icelandic Happy Marriage Cake: A Sweet Spring Delight
Ingredients
Equipment
Method
- Line a 20 cm (8-inch) round cake tin with parchment paper. In a medium saucepan, combine fresh rhubarb, superfine sugar, and vanilla extract. Cook over medium heat for about 15 minutes, stirring occasionally, until rhubarb is soft but holds shape. Set aside to cool.
- Preheat your oven to 200°C (400°F). Blend rolled oats in a food processor until slightly finer. In a mixing bowl, combine oats, plain flour, brown sugar, ground cardamom, and baking soda. Cut in softened unsalted butter until coarse crumbs form, then mix in the egg to form wet clumps.
- Press about two-thirds of the dough into the prepared cake tin to cover the base and sides evenly. Spoon the cooled rhubarb compote onto the crust and spread it evenly. Crumble the remaining dough over the top. Bake for approximately 25 minutes, or until golden and crisp.
- Once baked, let the cake cool in the tin for a few minutes. Transfer it to a wire rack to cool completely. Slice and serve with whipped cream for an indulgent touch.

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