Crustless Leek And Potato Quiche
["2 tsp. butter", "3 leeks, quartered lengthwise, sliced crosswise 1/2-inch thick and rinsed well", "1 large potato, cut into 1/2-inch cubes", "1/4 tsp. salt", "1/4 tsp. pepper", "1/3 c. water", "3 large eggs", "1 c. milk", "1/2 c. Ricotta cheese", "3 Tbsp. Parmesan cheese"]
["Preheat the oven to 375\u00b0.", "Lightly grease a 10-inch quiche dish or pie pan.", "Set aside.", "In a 10-inch skillet, melt butter over moderate heat.", "Add leeks, potatoes, salt and pepper.", "Cook for 1 minute.", "Add the water; simmer, covered, for 12 minutes."]
["butter", "leeks", "potato", "salt", "pepper", "water", "eggs", "milk", "Ricotta cheese", "Parmesan cheese"]