Julia Child's Tian de Courgettes au Riz (Zucchini Tian)

INGREDIENTS

• 2 large cloves garlic, mashed or finely minced
• 3 to 4 tablespoons olive oil
• About 2 1/2 cups warm liquid: zucchini juices plus milk, heated in a pan (watch this closely so that it doesn't curdle)
• 2 tablespoons flour
• A heavily buttered 6- to 8-cup, flameproof baking and serving dish about 1 1/2 inches deep
• 2 tablespoons olive oil
• 1 cup minced onions
• 2 to 2 1/2 pounds zucchini
• About 2/3 cups grated Parmesan cheese (save 2 tablespoons for later)
• 1/2 cup plain, raw, untreated white rice
• Salt and pepper