A jalousie refers to a pastry that is made of two layers of dough, surrounding a filling. The edges of the two layers are pinched together by hand, or crimped with the tongs of a fork. Before baking, slits are cut in the top crust. This will allow steam to escape during baking and also create decorative windows in the crust—like a jalousie window.
3 tablespoons olive oil
1 onion, diced
1 pound shiitake mushrooms, stems discarded, chopped
3 potatoes, peeled and cubed
¼ cup mayonnaise
Salt and pepper
Pinch of nutmeg
36 puff pastry squares, thawed slightly
1 egg, slightly beaten
Boil potatoes until soft; about 20 minutes. Drain well and mash.
In a large sauté pan, heat olive oil. Sauté onions until limp. Add mushrooms and sauté until liquid evaporates. Add potatoes, mayonnaise and seasoning. Mix until smooth.
Preheat oven to 375 degrees F. Place 1 puff pastry square on your floured work surface. Place 1 heaping teaspoon filling in the center. Brush egg on border. Take another square, dust with flour and fold lightly in half. Cut 6-7 parallel slits to the fold, cutting through the fold, leaving a narrow border all around. Unfold square and place on top of the filling. Press edges down with fingers to adhere. Bake for 20 minutes until golden.
Jalousie can be prepared in advance and frozen raw. Bake for 25-30 minutes or until golden.