Birthday Cake Microwave Sponge (Recipe adapted from John Placko & Albert Adria)

4 eggs
80g sugar
40g flour
1 pinch of salt
2 N2O charges

1. Process all ingredients in a blender
2. Strain mixture into ISI
3. Close and charge with two N20 charges
4. Refrigerate for 12 hours

5. Dispense cake batter into different bowls and mix with one drop of food colouring.
6. Layer colours into a a prepared paper cup
7. Microwave for 40 seconds on high.