In a bowl, mix the butter with the sour cream.

Add flour, baking powder and 0.5 teaspoon of salt. Knead the dough.

You will get a soft and fine dough, leave it aside until you prepare the filling.

Drain the oil / water well, add the greens, a little salt and pepper to taste - mix well.

Spread the tart dough in a baking dish greased with a little butter.

Put the fish filling, distribute it evenly.

In a bowl, mix sour cream, eggs and 2 tablespoons of flour.

Pour this mixture over the filling. Spread the whole surface with a spoon.

Bake the tart in a preheated oven at 200 degrees for about 35 minutes, until nicely browned and evenly browned.

After cooling, sprinkle a little green on top.

And serve with great pleasure :)

Good appetite!