Chocolate banana ice cream sandwiches

Instructions

1. Put the banana pieces into freezer bags and freeze for at least 3 hours.
2. Put the frozen banana pieces in a food processor and blitz until creamy, scraping down the sides of the bowl halfway through.
3. Spoon the puréed frozen banana onto 4 of the biscuits, then top each one with another biscuit and gently press together to make 4 ice-cream sandwiches. Serve immediately.