Alas, I was mistaken. The brownies that Patrick brought back from the US were not from my mother, but rather my sister Julie. Thanks Julie ! Oops.
Anyway, several of you have asked for the recipe, so here it is. (Unfortunately it's in US measurements, but they are pretty easy to convert to) Probably the hardest thing would be to find a chocolate with the equivalent fat content or consistency.
Carrie Noonan's Chewy Chocolate Brownies
1 1/3 cup sugar
2 eggs
1 1/2 sticks melted butter
2 tsp vanilla
1 1/3 cup flour
3/4 cup baking cocoa with 2 tablespoons water OR 4-6 oz melted bittersweet chocolate
1/2 tsp baking powder
1/4 tsp salt
Mix sugar and eggs
Add butter, chocolate mixture, and vanilla
Add dry ingredients
Bake in greased 13x9 (inches) pan at 350 (F) for 18-25 minutes
Batter should be thick and you will need to spread it out in the pan
WARNING: If you're french, you might want to lower the sugar content a little, since it may prove to be too sweet to your palate.