1 tablespoon olive oil
1 medium onion, chopped
2 carrots, sliced
2 stalks celery, sliced
3 (16 ounce) can diced plum tomatoes
4 teaspoons Italian seasoning
2 cubes beef bouillon
6 cups water
2 zucchinis, quartered and sliced
2 cups sliced cabbage
1 teaspoon garlic salt
salt and ground black pepper to taste
freshly grated Parmesan cheese (optional)
Heat oil in a large stock pot over medium-high heat. Saute onion, carrot, and celery until onion is translucent and vegetables are tender, 5 to 7 minutes. Stir in tomatoes and Italian seasoning, and cook 5 minutes more, stirring frequently.
Dissolve bouillon cubes in water, and stir into vegetables. Adjust heat to a medium simmer, and cook approximately 10 minutes. Add zucchini and cabbage, sprinkle with garlic salt, and cook until tender, 5 minutes more. Adjust seasoning with salt and pepper, and serve.