INGREDIENTS - makes 15 pieces

4 medium eggs
100g unsalted butter
1tsp instant coffee granules
200g milk chocolate
200g dark chocolate
100g caster sugar

1. Pre-heat your oven to 180oc
2. Line a rectangular baking tin with greaseproof paper
3. In a bowl over a pan of hot water, stir together your chocolate, coffee granules and butter until melted
4. Take off the heat when mostly melted so it doesn't get too hot
5. Separate your eggs putting the whites in a large bowl
6. Whisk the egg yolks until they start to lighten in colour and go creamy
7. Add the yolks to the chocolate gently
8. Whisk the egg whites in the large bowl then slowly add sugar until you have soft peaks
9. Add a third of the egg white to the chocolate mixture and mix vigorously to combine
10. Fold in the remaining egg white mixture a third at a time careful not to knowck the air out
11. Gently pour into your lined baking tin and even out with a spatula or the back of a spoon
12. Bake for 25-30mins 
13. Test with a toothpick (it should come out slightly gooey) leave to cool in the baking tray out of the oven.