Pastel Ice Cream Sandwiches

Make a stash of these and whisk them out of the freezer at any children’s party. I have made the ice cream and shortbread, but you could cheat and buy 90 biscuits and 1 litre of good-quality ice cream. Try flavouring the ice cream with cocoa powder, fruit purée, or small chocolate chips. No need for an ice cream machine if you don’t have one.