Melt butter and bacon fat in large pot. Cook onion, celery and garlic until tender.
Add seasonings. Add flour and instant mash potatoes.
Turn off flame and stir until all flour is no longer visible.
Add clam Juice and stir.
Turn flame on high and continue stirring to avoid sticking.
Bring to a boil.
Add potatoes. Stir, cook for 15 minutes or until potatoes are tender. Add clams. Stir. Add cream. Stir. Add parsley. Stir.
Simmer for 1/2 hour. Add salt or pepper to taste.Makes 4 to 6 Source: