Dessert sandwiches with strawberries and mascarpone cheese cream

MAKES 10 SANDWICHES READY IN ‘30   INGREDIENTS ½ cup all-purpose flour ½ cup potato starch 1 teaspoon baking powder   3 eggs A pinch cream of tartar 2 tablespoons warm water 3 oz sugar 1 packet vanilla   1 tablespoon butter, melted Sugar to taste   8 oz mascarpone cheese ½ cup double cream […]