My mum's Summer Vegetable Stew

Needs:
Olive oil
1 white onion, diced
Garlic cloves, minced
Dried basil, maybe half a tablespoon? I really don't know.
3 carrots, sliced thin
2-3 zucchini, in quarter slices
2-3 summer squash, in quarter slices
Fresh or frozen green beans, chopped
1 large can crushed tomatoes (unseasoned)
1 large can diced tomatoes (unseasoned)
1 15 oz can black beans
1 15 oz can white or kidney beans
Vegetable stock (or chicken, whatever, really, I just use whatever I have)


Sautee onion until clear, around 5 minutes. Add garlic, carrots, and basil, and cook for another 5-10 minutes. Add all fresh vegetables (zucchini, summer squash, and fresh green beans if using them) and cook some more, another 5-10 minutes. Add tomatoes and vegetable stock, and let simmer for at least an hour. Add beans and frozen green beans 15-20 minutes prior to serving. Serve with shredded parmesean cheese or, in my case, challah.