Puerto Rican Mondongo

Name: Puerto Rican Mondongo
Prep time: 40 min
Cook time: 2 h 40 min
Total time: 3 h 20 min
Cuisine: Caribbean
Ingredients: 3 pounds beef tripe, trimmed of fat and cut into cubes; 4 lemons, juiced; water to cover; 3 quarts beef stock, divided; 8 ounces cassava, peeled and cubed; 8 ounces potatoes, peeled and cubed; 8 ounces yams, peeled and cubed; 8 ounces pumpkin, peeled and cubed; 8 ounces sweet potatoes, peeled and cubed; 0.5 (16 ounce) can tomato sauce; 0.66666668653488 cup sofrito; 1 ear corn, cut into 1-inch pieces; salt and ground black pepper to taste