1. Heat oil in a pot as you dice onions. Add the onions and let them steam until transluscent. Add salt.
2. Cube zucchini and cauliflower, add to pot, and salt again. Let soften.
3. Slowly add water to cover. Add seasonings, cover, and let simmer 30-60 minutes.
4. Once softened, blend into a smooth puree.
5. Garnish as desired.