Add almonds to food processor and blend until coursely chopped.
Add pitted dates and blend until a sort of dough forms.
Press this into the bottom of a small dish lined with baking paper (about 3 inches by 8 inches).
Don't bother cleaning out the food processor - add the coconut oil, bananas and mango and blend until smooth.
Pour this over the top of the base.
Freeze for 3 hours before slicing and serving.
Keep uneaten portions in the freezer.