Step 1

Put the custard and chocolate in a saucepan. Gently heat, stirring, until the chocolate has completely melted into the custard. Cover the surface with cling film to stop the custard forming a skin, then cool.

Step 2

Sit the brownies in a trifle bowl and mix together the coffee with the 1 tbsp Irish cream liqueur. Drizzle all over the brownies. Use a rolling pin or saucepan to gently bash the bag of Maltesers a few times to crush a little, then sprinkle about three-quarters over the brownies. Spoon the cooled chocolate custard all over the top, then cover and chill.

Step 3

Make the final layer by combining the cream and 100ml Irish cream liqueur in a bowl. Sift over the icing sugar, then whip until soft peaks form. Cover and chill until you’re ready to serve.

Step 4

To serve, give the cream a quick mix, then spoon on top of the chocolate custard. Scatter over the last few crushed Maltesers to decorate.