Making the dough (or use pre-made dough)

1. Mix the dough ingredients together until smooth, wrap the dough in plastic wrap and let it rest for four hours in the refrigerator.
2. Roll it out thinly with a rolling pin or using the thinnest setting of a pasta machine and cut into 8 cm diameter circles.
3. Place the circles in small tart forms, place a new tart form over it and fill with beans. Bake at 175° C (340° F) for 10 minutes. (Pre-baked tart shells may also be used.)

Making the filling

1. Chop the mushrooms, shallots and parsley.
2. Sauté the mushrooms in a little oil; add the butter, shallot and parsley and cook 1 minutes longer. Season with salt and pepper and place in the tart shells.
3. Heat the milk, season it with salt and pepper, foam it with a hand mixer and pour over the tarts.