Potato-Stuffed Tomatoes
["6 medium size firm ripe tomatoes", "3 large potatoes", "1/3 c. milk, heated", "1/4 c. butter or margarine", "1 egg white", "1/2 c. grated Parmesan cheese", "3 Tbsp. finely chopped scallions", "1/4 tsp. salt", "1/8 tsp. white pepper", "1/2 c. Gruyere cheese"]
["Cut thin slice off tops of tomatoes.", "Scoop out insides; turn upside down to drain.", "Scrub potatoes well; cook in 1 inch boiling, salted water for 35 to 40 minutes, or until tender. Drain; peel.", "In a large bowl, beat potatoes, milk, butter and egg white together until smooth.", "Beat in remaining ingredients.", "With a pastry bag or spoon, fill tomatoes with potato mixture.", "Place in shallow baking dish.", "Bake at 350\u00b0 for 20 to 25 minutes, or until potatoes are golden.", "Makes 6 servings."]
["firm ripe tomatoes", "potatoes", "milk", "butter", "egg", "Parmesan cheese", "scallions", "salt", "white pepper", "Gruyere cheese"]