In a large frying pan, cook the sausage over medium heat for about 10 minutes, breaking up the sausage with a wooden spoon, until browned and cooked through. Use a slotted spoon to remove the sausage to a plate to cool a bit, leaving the fat in the pan.
In the same pan, add the butter, onions and celery. Cook over medium heat, stirring occasionally, for about 7-10 minutes, or until the vegetables are soft and translucent.
Add the garlic and any dried herbs you are using, and cook 2 more minutes.