Lemon Pudding Cake | Williams Sonoma

Ingredients

• 2 to 3 large lemons
• 1 cup sugar
• 1/4 cup all-purpose flour
• 1/8 tsp. salt
• 4 Tbs. (1/2 stick) unsalted butter, melted
• 3 eggs, separated
• 1 1/4 cups milk
• 1/4 tsp. cream of tartar
• Whipped cream for serving (optional; see note above)