Slow Cooker Lamb Shanks in Rosemary Red Wine Sauce

Name: Slow Cooker Lamb Shanks in Rosemary Red Wine Sauce
Ingredients: 8 medium lamb shanks (approximately 12 ounces per shank); 2 teaspoons salt; 2 teaspoons pepper; 4-5 tablespoons of olive oil; 1 onion (diced); 1 cup celery (diced); 1 cup carrots (diced); 3 cloves garlic (minced); 1 bottle dry red wine (such as Merlot, Cabernet Sauvignon, or Cotes de Rhône (750ml)); 28 oz can crushed tomatoes; 4 tablespoons tomato paste; 2 cups chicken broth (Pacific Foods chicken broth is gluten-free); 3 sprigs rosemary