The mashed sweet potatoes and plantains are my favorite. They are sweetened with a little brown sugar, but the sweetness of the plantains comes out by pan frying it instead of boiling it.
Peel and dice the potatoes into 1 inch cubes. Place into a pot of cold water (the water should completely cover potatoes) and bring to a boil. Boil until potatoes are fork tender. Strain.
While the potatoes are cooking, slice the plantains into 1 inch thick slices. Place some butter in a pan and pan fry the plantains until golden brown.
Mash the potatoes and plantains together, then add milk, 2 tbsp butter, salt, and brown sugar.