Patty preparation:

1. Soak the fava beans in water over-night, or until very tender. Remove skin if present.
2. Combine the fava beans, onion, garlic, parsley, cumin, coriander, baking powder, salt and pepper in a blender. Grind until mixture becomes very smooth (it helps if you partially chop, or dice the ingredients before you put them in the blender).
3. Let paste rest for 30 minutes.
4. Take walnut-sized lumps and make round, flat patties. Let the patties rest for about 15 minutes to preserve their shape.
5. Heat oil in a deep pan so that the patties can be submerged. Fry the patties until golden brown. Place them on a plate covered with paper towels to absorb excess oil.
6. Serve with pitta bread and yogurt tahini dip.

Yogurt Tahini Dip preparation: Combine all  the ingredients. Blend well and refrigerate.