Preheat oven to 170 degrees C. Line 2 baking trays with baking paper.
Chocolate Dough: With an electric mixer beat sugar, butter and egg. Add milk.
Fold in flour and cocoa until well combined. Put aside.
Strawberry Dough: With an electric mixer, beat sugar, butter and egg. Add milk, food colouring and essence. Fold in flour until well combined.
To Assemble: Using a lightly floured board, get a heaped teaspoon of
strawberry dough and roll into a sausage about 12cm long. Do the same with a heaped teaspoon of chocolate dough.
Join at one end and twist together (roll one over and under the other). Cut in half. Continue with the rest of the dough.
Place 12 to a tray and cook for 10 to 12 minutes. Cool completely and drizzle with icing.
Icing: Mix all the ingredients together, adding enough milk to make a slightly runny paste. Drizzle over biscuits.