1. Heat the olive oil in a large skillet over medium heat. Add the mushrooms, celery, onion, garlic, chiles, cumin, oregano, and celery seeds and cook, stirring, for 10 minutes.
2. Add the remaining ingredients, bring the pot to a boil, reduce the heat to low, cover, and simmer for 10 minutes. Let the salsa cool before serving it.
Steve’s Salsa will keep, tightly covered, in the refrigerator for up to a week.