If you enjoy full-flavored, spicy Mediterranean foods, you'll love this rich soup. Like most soups, it's forgiving as to quantities and substitutions. The only ingredient that may need to be searched for is tahinibut it can be left out without any great loss. If you don't have coriander and cumin, you might substitute a mild curry powder. Use more or less cayenne pepper to adjust the 'heat' (add some to the cooking soup and more, if desired, to servings).
Potatoes. For creamier soup, choose russets or Yukon Gold. If potatoes are new and have tender skins, just wash and brush the potatoes rather than peeling.
Stock. Use chicken or vegetable stock, water saved from draining boiled potatoes, or just plain water. A good choice is a mixture of stock and water. Use more or less stock to adjust soup thickness to your liking.
Tahini. Tahini is a thick paste made from ground sesame seeds and frequently used in Oriental, Mediterranean, and Mexican-style dishes.
Spinach. Fresh baby spinach is ideal. Wash leaves carefully, remove larger stems, then shred with fingers or chop coarsely. Use loose-packed frozen spinach as an alternative.