Onion Tart Recipe

Ingredients

• For pastry dough:
• 2 cups flour
• 1/2 cup cold butter, cut into bits
• 1 teaspoon salt
• 4 to 8 tablespoons ice water
• Filling: 1 lb. onions chopped
• 2 tablespoons olive oil
• 1 large egg
• 1/2 cup heavy cream