Ground Beef Vegetable Soup

Name: Ground Beef Vegetable Soup
Prep time: 10 min
Cook time: 55 min
Total time: 1 h 5 min
Cuisine: European, World Cuisine
Ingredients: 1 T olive oil, divided; 2 lb. lean ground beef (see notes); salt and fresh-ground black pepper to taste; 1 medium onion, chopped; 1 cup chopped celery; 1 T minced garlic; 1 T dried parsley; 1 1/2 tsp. dried thyme; 2 tsp. Spike Seasoning (see notes); 1/2 tsp. ground fennel (probably optional but recommended); 6 cups beef stock (see notes); 1 14 oz. can vegetable broth; 2 14.5 oz. cans petite dice tomatoes; 4 cups chopped cabbage; 1 1/2 cups frozen cauliflower rice; 3 cups chopped spinach; 2 T Sherry Vinegar (see notes)