Celery and Carrot Soup

Name: Celery and Carrot Soup
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: Mediterranean
Ingredients: 3 tablespoons olive oil; 1 tablespoon butter (optional); 4 carrots (diced); 3 garlic cloves (minced); 1 onion (chopped); 5-6 celery (chopped); 1+ litre water (or chicken/vegetable stock); 1 teaspoon salt to taste; ¼ teaspoon black pepper; 1 tablespoon chopped fresh dill or dry dill flakes