1Place water, beef ribs, parsnips, onions, carrots, celery, bay leaves, 1 teaspoon salt, 1 teaspoon black pepper, and 1 tablespoon fresh thyme into a large soup pot over medium heat; bring to a boil. Reduce heat to a simmer and cook, skimming and discarding foam that forms on top of broth, until broth is a rich brown color, 5 to 6 hours. (Broth may also be made in a slow cooker.) Strain broth, discard ribs and vegetables, and refrigerate extra broth.
3Mix flour, herbes de Provence, paprika, and garlic powder together in a bowl; sprinkle over browned onions. Cook and stir 5 minutes; season with salt and black pepper. Stir in parsley and 1 teaspoon thyme.