Hazelnut Cake
["1/2 c. plus 3 Tbsp. unsalted butter", "1 1/4 c. sugar", "3 eggs, separated", "1 tsp. vanilla extract", "1 c. hazelnuts, toasted, peeled and chopped fine", "1 3/4 c. pastry flour", "1 Tbsp. baking powder", "pinch of salt", "1/4 c. coffee"]
["Have all the ingredients at room temperature, especially the butter and the eggs.", "In a mixing bowl, cream the butter and 1 cup of the sugar until very light and fluffy, 3 to 5 minutes in a mixer.", "Add the egg yolks, one at a time, beating thoroughly after each addition.", "Beat in the vanilla, then the hazelnuts."]
["unsalted butter", "sugar", "eggs", "vanilla extract", "hazelnuts", "pastry flour", "baking powder", "salt", "coffee"]