Meatball soup

Ingredients (4 servings): 

• 1 onion
• 1 tbsp (olive) oil
• 3 cloves of garlic
• bunch of fresh parsley
• 1 tomato
• 2 sticks of celery
• 3 medium carrots
• 2 tsp paprika 
• salt and pepper to taste

For the meatballs: