01 -
2 tablespoons butter, unsalted.
02 -
2 tablespoons olive oil.
03 -
3 large yellow onions, sliced thin.
04 -
4 garlic cloves, minced.
05 -
1 tablespoon fresh thyme.
06 -
1/4 cup dry white wine.
07 -
5 cups beef broth, low-sodium.
08 -
1 tablespoon Worcestershire sauce.
09 -
12 ounces rigatoni pasta.
10 -
1 cup Gruyère cheese, shredded.
11 -
1/4 cup heavy cream.
12 -
Salt and black pepper.
13 -
Fresh parsley for garnish.