Mustard Braised Beef Recipe

Name: Mustard Braised Beef Recipe
Ingredients: 2 1/2 pounds brisket, tied in a round with butcher’s twine; 1 tablespoon ground mustard seeds; 1 tablespoon chopped fresh thyme; Freshly ground black pepper; Kosher salt; 2 tablespoons olive oil; 2 yellow onions, thinly sliced; 1 head of garlic, cloves separated, skin on; 1/3 cup Cognac; 1 1/2 cups dry red wine; 3 cups beef broth; 1 tablespoon unsalted butter, room temperature; 1 1/2 tablespoons unbleached all-purpose flour; 1 tablespoon Dijon mustard; 1/2 tablespoon whole grain mustard