One of my favs - definitely use vegetable stock! We always add lightly steamed kale (thinly sliced ribbons), or other leafy green. Definitely a 'base' recipe. You can replace shallots with onion, can skip the celery, etc.
Rating: 4 stars
Made this but added a tablespoon of homemade blend of spicy Moroccan seasonings, and leftover chicken broth (about a cup, then 5 cups water). Without these additions, it would have been extremely bland. It's more of a blank slate, fill with whatever seasonings fit your tastes.