Heat the oven to 400 degrees Fahrenheit
Grease and flour your financier or muffin tin
Melt the butter in a skillet over low to medium heat. Cook the butter stirring frequently until it turns a golden brown, taking care to scrape the brown bits off the bottom of the pan. Transfer to a bowl to cool.
Combine the powdered sugar, almond and AP flour in a mixing bowl.
Beat the egg whites until nice and frothy then add to the flour mixture and mix until smooth, around 3 minutes.
Stir in the brown butter and grated ginger into the batter.
Fold the lemon zest into the batter
Add the batter to the financier tin, filling until just over three quarters full.
Bake at 400 for around 7 minutes, or until the cakes start to rise. Reduce the heat to 375 and bake for another 5 to 7 minutes or until golden brown.
Cool in the pan for 5 minutes and then transfer to a rack to finish cooling. Serve and enjoy