In a small saucepan, melt butter over medium heat until bubbling. Whisk in brown sugar and white miso, stirring continuously for about 2 minutes until smooth.

Remove from heat and set aside approximately 3 tablespoons of miso caramel for drizzling later.

In a large mixing bowl, combine sliced apples with lemon juice, cinnamon, and nutmeg. Toss to coat.

Preheat your oven to 375°F (190°C). Fit a pie crust into a pie plate and layer the spiced apple mixture into the crust.

Pour the reserved miso caramel evenly over the apples, allowing it to cascade down.

Bake for 30-35 minutes, until crust is golden brown and filling is bubbling.

Let the pie cool for at least 15-20 minutes before serving. Drizzle remaining miso caramel over slices if desired.