Red Wine-Braised Pork Stew

Name: Red Wine-Braised Pork Stew
Cuisine: American
Ingredients: 2 pounds pork bone-in country-style ribs, cut in 2-inches cubes; Kosher salt and freshly ground black pepper; 3 tablespoons vegetable oil; 3 medium onions, chopped; 1 tablespoon tomato paste; 1 750 ml bottle dry red wine; 10 sprigs flat-leaf parsley; 8 sprigs thyme; 1 teaspoon oregano; 2 sprigs rosemary; 4 cloves garlic, grated; 4 cups low-sodium beef or chicken stock; 1 teaspoon red chili pepper flakes, optional