Hearty Hamburger Soup

INGREDIENTS

• 2 lbs lean ground beef
• 1 white onion, peeled and diced
• 1/4 teaspoon ground black pepper, more to taste
• 1/2 teaspoon dry oregano, more to taste
• 1/2 teaspoon dry basil, more to taste
• 1/4 teaspoon seasoning salt
• 1 (1 1/2 ounce) envelope onion soup mix
• 6 cups water, more to desired consistency
• 1 (8 ounce) can tomato sauce
• 1 tablespoon soy sauce
• 1 (15 ounce) can diced tomatoes, undrained
• 1 (15 ounce) can corn, drained
• 1 cup celery, sliced
• 1/4 cup celery leaves, coarsely chopped
• 1 cup fresh carrot, sliced
• 1 cup white potato, peeled and cut into small cubes
• garlic salt, to taste
• shredded parmesan cheese, to serve
• sour cream, to serve