In a bowl, work the flour, baking powder and shortening with your hands until the mixture resembles coarse sand. Add the water and form into a ball. Roll out and line about sixteen 7.5-cm (3-inch) tart pans.
Place the tarts on a baking sheet. Keep aside in the refrigerator.
Combine all the ingredients. Pour into the tart shells. Bake in the lowest position of the oven for about 10 minutes at 200 °C (400 °F), then 15 minutes at 180 °C (350 °F). Let cool and serve.
Recipes with the "Healthy Pick" stamp have been evaluated by a registered dietitian member of the Ordre professionnel des diététistes du Québec.