MUSHROOM QUICHE

Ingredients

• 350 grams (12.35 ounces) flour
• 200 grams (7.05 ounces) butter (82%)
• 4 tablespoons ice water
• 2 egg yolks (10 grams)
• A pinch of salt
• 400 grams (14.10 ounces) oyster mushrooms (only caps)
• 300 grams (10.60 ounces) mini champignons
• 1 medium onion
• Salt to taste
• Crushed pepper mixture to taste
• Vegetable oil for frying
• 125 grams (4.40 ounces) Camembert cheese
• 50 grams (1.75 ounces) Dutch cheese
• 200 grams (7.05 ounces) sour cream (20%)
• 100 milliliters (3.40 fluid ounces) cream (33%)
• 70 milliliters (2.40 fluid ounces) milk (2.5%)
• 2 egg whites
• 1 egg
• 8 green onion feathers