Sweet Plantain Rum Cake with Maple-Walnut Streusel

For when the plantains go black and you don't want to fry them.

Sweet Plantain Rum Cake
Yield: 1 8-inch cake

Ingredients:
1 medium overripe plantain, mashed
73 grams coconut oil, melted
275 grams coconut milk
1 tablespoon dark rum, such as Don Q 7, OR vanilla extract
166 grams brown sugar
200 grams all-purpose flour
1 1/4 teaspoon baking soda
1 teaspoon baking powder
1/2 teaspoon kosher salt
2 teaspoons Burlap & Barrel Goan Mas…