Quiche (Pissaladière) | Family | Umami

Ingredients

• 2 tablespoons olive oil
• 2 cups chopped onions
• 1 garlic clove, minced or pressed
• ¼ teaspoon salt
• 3 tablespoons chopped fresh basil
• 4 eggs, lightly beaten
• 1 cup milk
• ¼ teaspoon dry mustard
• 1 tablespoon unbleached white flour
• ⅓ cup freshly grated Parmesan cheese
• ¾ cup grated mozzarella cheese,
• packed (4 ounces)
• ⅓ cup sliced, pitted black olives
• 1 medium tomato, thinly sliced