An excellent cake for an afternoon break, best with coffee or a nice cup of tea. The coffee brings out the taste of chocolate and pairs nicely with the cardamom. Ideally, use a stronger coffee, like Italian espresso.
Preheat oven to 350º F. Place a rack at the center of the oven.
Butter and flour a 9-inch square mould.
Mix the flour, cocoa powder, baking soda, baking powder, salt and cardamom in a bowl. Set aside.
Cream the butter with the sugar in a mixer for around 2 minutes. Add the eggs, one at a time, and incorporate well. Add the vanilla and coffee.
Incorporate the dry ingredients gently by hand until the dough is smooth.
Transfer to the mould and bake in the oven for around 40-45 minutes. Cool for 20 minutes before removing from the mould.