Make this recipe a recipe that people in that category can eat. categories: ['low_calorie'], recipe: for sauce, melt butter in a saucepan, then blend in flour. cook over moderate heat and slowly stir in milk. season with salt and pepper and continue cooking until sauce is smooth and boiling. reduce heat and add cheese, stirring, until cheese is blended, then add green pepper/pimento mixture, stir, and remove from heat. grease a baking dish and fill with alternate layers of potatoes and sauce. bake in moderate oven, 350 degrees, until potatoes are done, about 1 to 1-1/2 hours. potatoes may be turned with a spoon to ensure even cooking.

Target recipe: sauce: in saucepan, melt butter over medium heat; cook flour, salt, rosemary and pepper, stirring, for 1 minute. gradually whisk in milk; cook, whisking constantly, until boiling and thickened, 12 to 15 minutes. set aside. peel and thinly slice yukon gold and sweet potatoes. layer half of the yukon gold potatoes in greased 13- x 9-inch (3 l) glass baking dish; spread with half of the onion. layer with sweet potatoes then remaining onion and yukon gold potatoes. pour sauce over top. cover with greased foil; bake in 350°f (180°c) oven for 1 hour. sprinkle with parmesan cheese; bake, uncovered, until lightly browned and tender, about 30 minutes. let stand for 10 minutes before serving.