Heat oil in a large soup pot. Add onion; celery and saute over moderate heat until golden and soft, but not brown. Add potato, carrots, vegetable stock, celery leaves, tomatoes and cumin.
Bring to a boil. When boiling immediately reduce heat. Cover and cook, simmering, for 15 minutes. Add cauliflower and continue to simmer for 10 minutes more. Season to taste.
You can serve this right away, but it is best to develop the flavor by refrigerating overnight.
Just before serving, heat soup and add remaining ingredients. Simmer for 10 to 15 minutes. Add more water if needed. Serve with 3 to 4 matzo balls per bowl.
Contributor: pat ciesla
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