Best-Ever Clam Chowder

1 cup onion, chopped fine
1 cup celery, chopped fine
3 cups diced potatoes
3 (6 ½ oz)cans minced clams and juice
¾ cup butter
¾ cup flour
1 qt. half and half
1 ½ tsp salt
Dash pepper
2 T. red wine vinegar

Drain juice from clams; pour over vegetables in large pot.  Add enough water to cover vegetables and simmer until tender.  Melt butter and add flour for sauce;  cook constantly, adding half and half until thick.  Add all together, then add clams and vinegar.  Heat thoroughly.  Do not boil.

Note:  For the clams, use a 51oz can of clams.  It is huge, but makes the clam chowder wonderful.  The large cans can be bought at Costco.