Gumbo Zherbes

Name: Gumbo Z'herbes
Ingredients: 8 cabbage leaves (from 1 large head); 1 lb mustard greens; 3/4 lb turnip greens; 1/2 lb beet greens (from 1 bunch beets; including stems); 2 smoked ham hocks (1 lb each); 2 medium onions, finely chopped; 2 garlic cloves, minced; 2 tablespoons unsalted butter; 2 tablespoons all-purpose flour; 1 tablespoon fresh thyme or 1 teaspoon dried thyme; 1 to 2 small fresh hot red chiles (2 to 3 inches long), minced, including seeds; 10 oz baby spinach; 1/4 cup finely chopped fresh parsley; 3 tablespoons cider vinegar plus additional for serving; 1 teaspoon salt, or to taste; Accompaniments: hot sauce such as Tabasco; corn bread or rice