In a large bowl beat together egg whites, eggs, granulated sugar, honey, liqueur, vanilla and salt with a wire whisk or an electric mixer on low speed till light and frothy. Stir in yogurt till mixture is smooth. Add flour; beat till combined and mixture is smooth.
Grease a 25 cm quiche dish; arrange desired berries in bottom of dish. Pour batter over fruit. Bake in a 375� oven for 30-35 minutes or till center appears set when shaken. Cool on a wire rack for 30 minutes. Serve warm. Just before serving, sprinkle with powdered sugar and, if desired, garnish with additional raspberries and edible flowers.