Sauté Onion, Garlic, Celery, Mushrooms: Add 1 tbsp olive oil in the pot. Add sliced onion, sauté. Add a pinch of kosher salt and ground black pepper to season. Stir occasionally until slightly browned. Then, add minced garlic and stir for roughly 30 seconds until fragrant. Add sliced mushrooms, chopped celery, a pinch of dried oregano, and dried basil. Cook for another minute. Taste seasoning and adjust with more kosher salt and ground black pepper if necessary.