In a stock pot, heat oil. Add onion, celery, tomato, potato, turnip, and garlic. Cook until vegetables are tender, about 10 minutes.

Add remaining ingredients. Cover, bring to a boil, reduce heat, and simmer 1 hour.

Strain stock and discard the vegetables, bay leaf, and parsley.

Stock may be used immediately, refrigerated for 3-4 days, or frozen for up to 1 month.