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
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