Pasta gratin

Name: Pasta gratin
Prep time: 20 min
Cook time: 30 min
Total time: 50 min
Yield: 6 servings
Cuisine: French, European
Ingredients: 1 handful of Grated mozzarella; 1 tsp of Ground nutmeg; 100 gr of Parmigiano cheese; 75 gr of Plain flour; 500 gr of Rigatoni pasta; 750 ml of Semi skimmed milk; 75 gr of Unsalted butter