Tear the bread into small pieces. In a large bowl, mix the bread with coconut milk and sugar. Mash 4 bananas and add them to the bread mixture along with the flour, raisins, and vanilla extract. Mix well.

Grease a baking pan with butter. Slice 2 bananas thinly and arrange them on the bottom of the pan. Place the pan in the oven briefly to melt the butter and let it soak into the bananas. Pour the bread mixture into the pan. Slice the remaining 2 bananas and arrange them on top. Sprinkle with extra raisins and sliced almonds for decoration. Preheat the oven to 350°F (175°C) and bake for 40 minutes. When the cake is done, brush the top with a little butter to give it a shiny finish. Let the cake cool completely before removing it from the pan. For best texture, let it sit for a day before serving.