In a bow, mix flour with baking powder and salt. Dig a hole at the center of the mixture. Pour water and oil in the hole. With hands, until obtaining an homogenized dough.
Preheat oven at 205 ºC (400 ºF).
Over a floured surface, set down the dough into two thin circles of 25 cm (10 inches). Set each dough over a baking sheet covered with parchment paper.
In a bowl, mix sauce with dill. Spread sauce over dough but let 1,5 cm (3/4 inch) free over sides. Divide minced leeks, scallops and parmesan.