"cook yourself thin" vanilla cupcakes

Ingredients

For the frosting:

• 3 large egg whites
• 1 cup sugar
• Pinch salt
• 3/4 teaspoon vanilla extract
• Finely grated zest of 1/2 lemon

For the cupcakes:

• 1 1/4 cup all-purpose flour
• 1/2 cup finely ground almonds
• 1 1/2 teaspoon baking powder
• 1/4 teaspoon salt
• 2 eggs
• 3/4 cup sugar
• 2 teaspoons vanilla extract
• 1 1/4 cups peeled zucchini, finely grated