Preparation Preheat oven to 400°F. and butter a 3-quart shallow baking dish. Fill a 6-quart kettle three fourths full with salted water and bring to a boil for macaroni. Make topping: Melt butter and in a bowl stir together with panko or regular bread crumbs and Cheddar until combined well. Topping may be made 1 day ahead and chilled, covered. Make sauce: In a 5-quart heavy saucepan melt butter over moderately low heat and stir in flour and red pepper flakes. Cook roux, stirring, 3 minutes and whisk in milk. Bring sauce to a boil, whisking constantly, and simmer, whisking occasionally, 3 minutes. Stir in cream, Cheddar, mustard, salt, and pepper. Remove pan from heat and cover surface of sauce with wax paper. Cook macaroni in boiling water until al dente. Reserve 1 cup cooking water and drain macaroni in colander. In a large bowl stir together macaroni, reserved cooking water, and sauce. Transfer mixture to baking dish. Sprinkle topping evenly over macaroni and bake in middle of oven 20 to 25 minutes, or until golden and bubbling. *Available at Asian markets and some specialty food shops and supermarkets and by mail order from Uwajimaya, (800) 889-1928.
Preparation Preheat oven to 400°F. and butter a 3-quart shallow baking dish. Fill a 6-quart kettle three fourths full with salted water and bring to a boil for macaroni. Make topping: Melt butter and in a bowl stir together with panko or regular bread crumbs and Cheddar until combined well. Topping may be made 1 day ahead and chilled, covered. Make sauce: In a 5-quart heavy saucepan melt butter over moderately low heat and stir in flour and red pepper flakes. Cook roux, stirring, 3 minutes and whisk in milk. Bring sauce to a boil, whisking constantly, and simmer, whisking occasionally, 3 minutes. Stir in cream, Cheddar, mustard, salt, and pepper. Remove pan from heat and cover surface of sauce with wax paper. Cook macaroni in boiling water until al dente. Reserve 1 cup cooking water and drain macaroni in colander. In a large bowl stir together macaroni, reserved cooking water, and sauce. Transfer mixture to baking dish. Sprinkle topping evenly over macaroni and bake in middle of oven 20 to 25 minutes, or until golden and bubbling. *Available at Asian markets and some specialty food shops and supermarkets and by mail order from Uwajimaya, (800) 889-1928.