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1
Line a fine-mesh strainer with cheesecloth; set over a small bowl. Add ricotta to strainer and let drain for 15 minutes; set aside.
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2
Gently combine berries, 1/3 cup sugar, and lemon juice in a medium bowl. Let macerate, tossing occasionally, until sugar dissolves and juices are released, about 15 minutes.
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3
Whisk both flours, baking powder, and salt in a large bowl. Using an electric mixer, beat egg whites in a medium bowl until frothy. Gradually beat in 2 tablespoons sugar, beating until peaks form. Whisk the egg yolks, remaining 2 tablespoons sugar, and zest in another medium bowl to blend. Whisk in milk. Add the yolk mixture to dry ingredients; whisk just to blend. Add half of the egg white mixture; fold just to blend. Fold in ricotta, then remaining egg white mixture.
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4
Heat a griddle or large heavy nonstick skillet over medium-low heat; brush with melted butter. Using scant 1/2 cup batter for each pancake and working in batches, ladle batter onto griddle and cook until bottom is golden brown, edges are dry, and bubbles form on top of pancake, about 1 1/2 minutes. Flip pancakes and cook until browned and just cooked through, about 1 minute. Transfer pancakes to plates. Serve with berries and their juices.
