Step 1

Place sugar, coffee and 2 tablespoons water in a saucepan over low heat, stirring until sugar dissolves. Bring to the boil. Remove from heat and cool. Place eggwhite, vinegar and cornflour in bowl of an electric mixer, beat for 2 minutes. Add coffee mixture in a slow steady stream, continue to beat on high for 10 minutes.

Step 2

Preheat oven to 100°C. Line 2 baking trays with baking paper. Spoon meringue mixture into a piping bag with a plain nozzle and pipe rosettes 2cm apart on trays. Bake for 30 minutes. Turn off heat and leave in the oven for 1 hour to dry.

Step 3

Place chocolate, butter, Nutella and coffee essence in a bowl, beat with electric beaters until thick and glossy. When meringues are cool, spread one meringue with mocha cream and another half with whipped cream, sandwich the two halves together.