Black Bean Soup
["1 lb. dried black beans", "6 c. chicken broth", "2 c. water", "2 small ham hocks (about 8 oz.)", "1/4 lb. salt pork", "1 bay leaf", "1 c. chopped onion", "1/2 c. chopped celery with leaves", "1 1/2 c. chopped green pepper", "1 large tomato, peeled and chopped", "1 clove garlic, minced", "6 serrano peppers, seeded and chopped", "1 can tomato paste (6 oz.)", "1/4 tsp. pepper", "1/4 tsp. hot sauce", "2 Tbsp. Worcestershire sauce", "lemon slices (optional)"]
["Sort and wash beans; place in a large Dutch oven.", "Cover with water 2 inches above beans.", "Let soak at least 8 hours.", "Drain. Add chicken broth, 2 cups water, ham hocks, salt pork and bay leaf to beans; bring to a boil.", "Cover, reduce heat and simmer 1 1/2 hours."]
["black beans", "chicken broth", "water", "ham hocks", "salt pork", "bay leaf", "onion", "celery", "green pepper", "tomato", "clove garlic", "serrano peppers", "tomato paste", "pepper", "hot sauce", "Worcestershire sauce", "lemon slices"]