- STEP 1
Preheat oven 180 C/ 350 F/ gas mark 4. lightly grease an 18cm/7 inch square baking tin.
- STEP 2
Chop 6oz of the chocolate and place remaining chocolate and butter in a heatproof bowl. set the bowl over a saucepan of gently simmering water and heat until melted. Stir together, then cool slightly.
- STEP 3
Place the eggs and sugar in a large bowl and whisk together. Beat in cooled chocolate mixture until combined. fold in flour and chopped up chocolate.
- STEP 4
Spoon the mixture into the tin and smooth the surface.
- STEP 5
Bake in a preheated overnight for about 30mins or until just set, and still a little soft in the centre. cool in the tin and cut into squares.