Bilad al-Sham Kitchen - Zucchini and potato soup

Zucchini and potato soup:

3 tablespoons of olive oil

1 chopped onion

2 sweet potatoes cut into cubes

10 medium sized zucchini

4 cups of chicken broth

Salt and Pepper

A teaspoon of ground cardamom

1/2 cup of cream, optional

1/4 cup chopped dill