INGREDIENTS
Salt
1 lb
Italian macaroni tubes or ziti
2 tbsp
butter, plus some to butter casserole dish
1/3 lb
sharp white cheddar, crumbled, about 1 cup
2 tbsp
olive oil
1/3 lb
chunk pancetta, cut into 1/4-inch dice
4 cloves
garlic, finely chopped
2
rounded tablespoons flour
2 1/2 cups
whole milk
1/4 tsp
fresh nutmeg
4
eggs, yolks and whites separated
1 tbsp
Dijon mustard
1 cup
grated Parmigiano-Reggiano cheese
1 1/2 cups
grated Gruyère cheese
1/4 cup
flat-leaf parsley, finely chopped
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