Ingredients 3 each potatoes,idaho,medium-size 1 water 3 teaspoon salt 2 tb salad oil 1/2 cup onion, chopped 1 teaspoon mustard, prepard 4 teaspoon celery seed 2 tablespoon cider vinegar 1/2 cup green pepper, diced 1/4 cup carrot, shredded Directions: Put potatoes in a large saucepan with 1 inch cold water and 1 teaspoon salt; bring to a boil. Cover, reduce heat and simmer 25 minutes, until potatoes are tender; drain and cool. Peel potatoes and slice 1/4-inch thick; set aside. Heat oil in a medium-size skillet; saute onion until soft. Stir in flour, mustard, celery seed and remaining 1/3 teaspoon salt. Gradually add 1/2 cup water and vinegar; cook over low heat, stirring constantly, until mixture boils and thickens. Combine potatoes, green pepper and carrots in a bowl; add sauce, mixing well. Spoon half the mixture into a shallow 8x8-inch baking dish; sprinkle with 1/2 cup cheese. Cover with remaining potato mixture and cheese. Bake, uncovered, in preheated 350'F. oven 15 to 20 minutes, or until cheese is melted and vegetables are hot.