Spanish Oxtail Stew

Name: Spanish Oxtail Stew
Cuisine: European, Mediterranean, Spanish
Ingredients: 1.5 kg oxtail pieces; Salt and black pepper, to season; 4 tbsp olive oil, divided; 1 large onion, finely chopped; 2 carrots, sliced; 2 celery stalks, diced; 1 red bell pepper, chopped; 4 cloves garlic, minced; 2 tbsp flour; 1 cup dry red wine; 4 cups beef broth; 2 bay leaves; 1 sprig fresh rosemary; 1 tsp smoked paprika; 1/2 tsp ground cumin; 1 large tomato, grated or diced; Fresh parsley, chopped (for garnish)