8 tablespoons butter, divided use
1 medium onion, diced
4 stalks celery, diced
2 cloves garlic, minced
1 sprig rosemary
4 cups turkey, vegetable or chicken stock, or milk, or combination of these
4 cups mashed potatoes
1 pinch of cayenne pepper
Salt and freshly ground pepper, to taste
Accompaniments - choose one or two of the following: diced ham, diced cooked bacon, sliced green onion, chopped parsley, snipped chives, shredded cheddar cheese