Chop the butter, flour, sugar and egg yolk in a food processor or directly on the work surface. Work into a dough that is allowed to rest in the fridge for half an hour.

Press out the dough in aluminum form or in a form with removable edge (24cm diameter). Rinse the blueberries and divide them into quarters. blueberries in and put in the form. Vispa ihop crème fraiche, eggs, sugar and vanilla. Pour batter over blueberries.

Bake in bottom of oven for about 25 minutes. Serve with sour cream.

2 cup flour, 1 tablespoons sugar, 75 g butter, 1 egg yolk.

Filling: 3-4 dl blueberry, 2 dl cream, 2 eggs, 3/4 cup sugar, 1 teaspoon vanilla.

Preheat the oven to 200 grader.