Cut the onion into thin slices and chicken and shrimp into bite-sized pieces. Cook the macaroni as directed on the package.
Melt margarine in a skillet, sauté the onion and chicken for about 3 minutes. Add the corn and shrimp, continue sautéing for 2 more minutes, then turn off the heat.
Add the flour in the Step 2 skillet, stir until incorporated for about 30 seconds.
Add the milk into the Step 3 skillet and mix it evenly.
Turn on the heat again and cook over medium heat. Stir with a wooden spoon for about 5-7 minutes until thick.
Add the finely chopped soup stock cube and the parmesan cheese. Adjust the taste with salt and pepper, and the white sauce is done.
Mix half of the sauce from Step 6 and the cooked macaroni, and put it in the casserole or gratin dish.
Pour the remaining white sauce onto the macaroni, top it with the shredded pizza cheese, and bake in the 250℃ oven until browned about 15 minutes and it is done.
It is very creamy and delicious.
Story Behind this Recipe
I've been making gratin this way for ages.
■ Make sure to turn off the heat when you add the flour. ■ I used a large casserole dish, but if you are using a small gratin dish, you can bake it in a toaster oven or in a fish grill since you just need to brown the top. ■ You can use whatever you prefer, but you must add the onions.