Step 1: Make the chocolate mousse
Step 2: Make the white chocolate lightning bolts
Step 3: Make the cream cheese-marshmallow fluff topping
Step 4: Put it all together
You will need - chocolate mousse, topping, lightning bolts, toothpick, black food colouring paste (not liquid), knife. Assemble - 1. Take the chocolate mousse out of the fridge. 2. Spoon the topping evenly and gently over the two coffee cups. 3. Take a toothpick and some black food colouring and swirl gently into the white mousse. Don't use too much. 4. Take a knife and use it to swirl the colouring into the topping, to create a slightly grey swirly 'cloud'. 5. Add the lightning bolts to your cup, use as many as you like. 6. Serve immediately (or place back in the fridge, ready to serve).