5 pounds beef short ribs
2 tablespoons Kosher salt
  Freshly ground black pepper
1/4 cup Chinese Five-Spice Powder
1/2 cup dry mustard powder
3 cups canola oil
1 1/2 cups diced onions (1/3 inch)
1 1/2 cups diced fennel (1/3 inch)
1 1/2 cups diced carrots (1/3 inch)
2 tablespoons minced fresh garlic
1 can (28 ounce) diced or crushed tomatoes (with juice)
4 cups (1 quart) orange juice
1 tablespoon ground fennel
  Grated zest of 2 oranges