In a bowl combine the flour sugar,baking powder and salt. Beat the eggs, milk and oil;stir into dry ingredients just untill moistened.Fold in blueberries.
Transfer to a greased 13 in x 9 in x 2in baking dish.sprinkle with coconut.
Bake at 375 degrees for 22-24 minutes or until a toothpick inserted in the center comes out clean.
In a small saucepan,combine sugar,cornstarch and lemon peel. gradually add water untill blended. Bring to a boil; cook and stir for 2 minutes or until thickened. Remove from heat; stir in butter and lemon juice. Drizzle onto cake. Yum!