Zest the lime onto the sugar and rub the zest into the sugar with your fingers
Add the all-purpose flour, almond flour, and salt to the sugar and whisk until combined.
Whisk the egg whites by hand until they are foamy. Add it to the dry ingredients and mix together.
Add the browned butter to the batter and fold in the butter until combined.
The batter will be thick and creamy. Divide the batter evenly between 12 mini cupcake or muffin molds
Add a blackberry to each cake and gently press into the top of the cakes. Bake the financiers for 12-14 minutes
Cool the financiers for 10 minutes in the pan and then finish cooling them on a cooling rack.
These cakes are great with coffee or tea as an afternoon snack or for dessert.