METHOD
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brown butter
Add butter to a saucepan and place over medium-high heat. In about 5 minutes, the butter will become brown, with a beautiful nutty aroma - don't stir it. Using a kitchen brush, gently brush the muffin pan with the brown butter. Place the muffin pan in the fridge for 5 minutes. The butter will harden, which will help prevent the muffins from sticking to the pan once baked. Preheat the oven to 220 °C / 430 °F.
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muffin batter
Using a hand whisk, gently beat the egg whites until they become frothy - make sure not to overbeat them. In a separate bowl, stir to combine all-purpose flour, sugar, ground almonds, lemon zest, and a pinch of salt. Add frothed egg whites to the flour mixture and stir to combine to get a smooth batter. Gradually, in two additions, incorporate brown butter and vanilla to the flour mixture.
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bake and serve
Spoon the muffin batter into muffin cups, filling them to about two thirds (2/3). Arrange three sour cherries or cherries on top of each muffin batter. Transfer to the preheated oven. Bake for 25 - 30 minutes at 190 °C / 375 °F or until a wooden pick inserted in the center of the muffin comes out clean. Transfer the baked muffins to a wire rack to cool completely.