Begin by combining mascarpone and sifted powdered sugar in a mixing bowl, blending them until smooth and creamy, about 2-3 minutes. In a separate bowl, whip the heavy cream with a hand mixer until fluffy peaks form, usually within 4-5 minutes. Gently fold the whipped cream into the mascarpone mixture, ensuring an airy texture for your luscious Strawberry Tiramisu.

In a shallow dish, combine freshly squeezed orange juice with half of the orange liqueur. Quickly dip each ladyfinger into the mixture, just long enough to soak them slightly, about 1-2 seconds. Layer the dipped ladyfingers in a rectangular dish, then spread half of the creamy mascarpone mixture over them, followed by half of the strawberry preserves and half of the sliced strawberries.

Continue creating the second layer by dipping another set of ladyfingers in the orange juice mixture and placing them neatly over the first layer. Carefully spread the remaining mascarpone cream mixture on top, followed by the rest of the strawberry preserves and the last layer of sliced strawberries.

Cover the assembled Strawberry Tiramisu with plastic wrap and place it in the refrigerator. Allow it to chill for at least 2 hours; however, letting it set overnight enhances the flavors even more.