Lemon Pudding Cakes - Once Upon a Chef

Ingredients

• 3 large eggs, separated
• 1 cup milk (low-fat or whole)
• 2 teaspoons lemon zest, from 2 lemons
• 6 tablespoons fresh lemon juice, from 2 lemons
• 2 tablespoons unsalted butter, melted
• ¼ teaspoon salt
• 6 tablespoons all-purpose flour
• 1 cup sugar
• Fresh berries and Confectioners' sugar, for serving (optional)