A simple way to make a custard-like dish from frozen pieces of banana, plus optional nut-butter and honey: http://www.seriouseats.com/recipes/2010/02/frozen-banana-ice-cre...

Ingredients
1 large, slightly over-ripe banana
1 teaspoon peanut butter
1 teaspoon honey

Peel banana. Slice it into about ten chunks. Freeze the chunks. Once frozen, put them in a food processor with peanut butter and honey. Puree until creamy, like soft serve ice cream, stopping the processor to scrape the sides when necessary.