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In a blender, combine 1/3 of the corn/onion saute with 1 T soy powder and 1/3 of the water and whiz. Set mixture aside. Repeat blending 2 more time with remaining 2/3 of the corn onion mixture, adding tahini to the final blender. A thick creamy texture is desired. Pour mixture back into the soup pot.
Add remaining ingredients and cook (don't boil) on medium-heat until the vegetables are soft.
posted by Mr Falafel