while waiting for the water to boil, you can start with the white sauce, simply melt butter, add flour, whisking to avoid it from curdling, followed by milk and chicken stock, stirring occasionally at all times till the sauce becomes thick
Actually, mean while, in between , before or after those two you can start making the filling. Mine, was a mixture of chicken , meatballs, fish fillet, crab meats and something which I didn't quite know what they were called which I found in the freezer and just threw them all in.,that is after sauteing the onion . when all the chickem etc are well cooked, add in thinly sliced potatoes and a dash of black pepper, abt 2 tsp, add in a little bit of water to soften the potatoes
Once all three main ingredients are ready, you just mix them all together
mixed with the white sauce
and in goes the macaroni, mix them well
done, and just before it went in the oven, sprinkle mozarella cheese on top. what I did was , I put in a bit of parmesan cheese, cheddar and mozarella, loads and loads of mozarella!