Macaroni Gratin made Japanese-style was my husband's favourite food in elementary school. His school served all the students lunches and often Macaroni Gratin was one of the features. How is Japanese Gratin different from our Macaroni and Cheese? Well, for one thing, there is far less cheese. Secondly, there is less macaroni. A true Japanese Gratin uses ample white sauce and only a sprinkle of cheese on top. The bread crumb topping is made of Panko, which is what tempura is coated in. The ingredients within the gratin are mostly vegetables and protein (usually shimp or chicken).
The gratin I made above uses shrimp, shiitake mushrooms, broccoli, onion and garlic. There is of course macaroni in there too, but much less than macaroni and cheese. The white sauce is simply 3 tbsp margarine, 4 tbsp flour and 2.5 cups milk. The top is seared using a kitchen torch. It does look a bit black, but tastes amazing! I highly recommend making this dish--you may never go back to regular mac and cheese!