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Heat oil in a large saucepan; add the squash and saute over medium heat for 3 minutes. Stir in eggplant, onion, garlic and cilantro; saute, stirring constantly for 5 minutes, adding more oil if necessary.
Stir in remaining ingredients and bring to boil. Lower heat, cover and simmer for 30 minutes, adding more water if necessary. Taste and add salt if needed.
Serve hot.
posted by Mr Falafel