INGREDIENTS
2 oz
unsalted butter, more for the baking sheet (1/4 cup)
4
medium-large yellow onions (about 2 pound), thinly sliced (8 cups)
Kosher salt and freshly ground black pepper
1 tsp
granulated sugar
1
small baguette (1/2 pound), cut into 1/2-inch slices
2 qt
Roasted Beef Broth or lower-salt canned beef or chicken broth
1
bay leaf
2 cups
grated Gruyere
5 lb
meaty beef or veal bones, such as shanks, knuckles, and ribs
2
medium carrots, cut into big chunks
2
medium yellow onions, quartered
1
bouquet garni (1 sprig fresh thyme, 1 bay leaf, and 4 parsley stems, tied with twine)
1 tbsp
black peppercorns
1 tbsp
tomato paste