Mix the flour, baking powder, and salt. In a separate container mix the fruit concentrate, milk and extract until blended well. Pour the liquid ingredients into flour mixture and mix until smooth. Don't overbeat.
Place a 9 inch square baking pan in oven with the teaspoon of margarine until melted. Swirl the pan around until it coats pan.
Pour batter into pan and sprinkle evenly with blueberries.
Bake for about 30 to 40 minutes, or until golden brown.
Mix the jam with the water. Heat until melted. Brush the top with the glaze when it comes out of the oven.
Cut into 9 squares and serve warm.
***Fruit concentrate is a available at health food stores.
***Can also use cranberries, strawberries, or sliced peaches.