1 tablespoon good olive oil
3 cups chopped yellow onions -
1 teaspoon chopped fresh thyme leaves
2 teaspoons kosher salt
1 teaspoon freshly-ground black pepper
3 tablespoons Worcestershire sauce
1/3 cup canned chicken stock or broth
1 tablespoon tomato paste
2 1/2 pounds ground chuck (81% lean)
1/2 cup plain dry bread crumbs
= (Progresso recommended)
2 extra-large eggs
1/2 cup ketchup
= (Heinz recommended)
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