
Heat a large pot to medium heat and add olive oil. Add the spicy sausage with the potato, peppers, onion and celery. Cook it all down about 10 minutes or so, until everything is nicely browned, stirring often.
Add the garlic and tomtillos and cook another minute.
Add the remaining ingredients (chicken stock, chili paste, seasonings), and stir. Bring to a quick boil, then reduce the heat and simmer at least 20 minutes. You can simmer longer if you’d like to further develop the flavor.
Ladle into bowls and top with fresh herbs.