Red Onion Tri-Mushroom Quiche - cooking recipe

Ingredients

1 1/4 cups flour
1/3 cup unsalted butter
1 egg yolk
3 tablespoons ice water
1 pinch salt
1/4 cup unsalted butter
1 large red onion, halved and sliced
4 ounces cremini mushrooms, sliced
4 ounces shiitake mushrooms, stemmed and sliced
4 ounces oyster mushrooms, stemmed and sliced
2 teaspoons fresh thyme, chopped
1 egg
2 egg yolks
1/3 cup heavy cream
salt and pepper

Preparation

Sift flour and salt into a bowl.
Add the butter and cut it into the flour until mixture resembles breadcrumbs.
Beat the egg yolk with the water in small bowl.
Sprinkle liquid onto flour mixture and combine with your fingertips.
Form dough into a ball.
Cover and chill for 30 minutes.
Preheat the oven to 375 degrees and grease pie or quiche pan with butter.
Roll out dough on floured surface and then line the pan.
Prick bottom with fork and chill for 30 minutes.
Line with foil and dried beans and bake in the oven for 25 minutes.
Remove the foil and beans and cool on a wire rack.
Reduce oven temp to 350 degrees.
Melt butter in a large, heavy bottomed skillet.
Add the onions, cover and cook over very low heat, stirring occasionally, for 20 minutes.
Add mushrooms and thyme and cook for an additional 10 minutes, stir often.
Spoon mixture into cooled tart shell and place the pan on a cookie sheet.
Lightly beat the egg with the egg yolks and cream ans season to taste with salt and pepper.
Pour mixture over mushroom filling and bake for 20 minutes or until the filling is set and golden.
Serve hot or at room temperature.