Black Walnut Cake - Foraged

Ingredients

• 1 cup chopped black walnuts
• 3 cups all-purpose flour, divided
• 1 cup butter, softened
• 2 cups sugar
• 4 large eggs, room temperature
• 1 teaspoon vanilla extract
• 2 teaspoons baking powder
• 1/4 teaspoon salt
• 1 cup whole milk
• 1-3/4 cups sugar
• 4 large egg whites
• 1/2 cup water
• 1/2 teaspoon cream of tartar