Ingredients:
– 
dark chocolate – 200 g
– 
butter – 100 g
– 
sugar – 250 g
– 
eggs – 3
– 
flour – 100 g
– 
walnuts (Grenoble walnuts) – 100 g
– 
vanilla extract – 1 teaspoon
– 
salt – a pinch
Ingredients:
– dark chocolate – 200 g
– butter – 100 g
– sugar – 250 g
– eggs – 3
– flour – 100 g
– walnuts (Grenoble walnuts) – 100 g
– vanilla extract – 1 teaspoon
– salt – a pinch