In a large pot, melt the butter over medium heat and saute the celery and onions until soft and translucent, 6 to 8 minutes. Mix the clam base with 1/4 cup water, and then add into the pot. Add the flour and stir to absorb the butter and thicken slightly. Add the clam juice, mixing well and bring to a boil. Reduce the heat to medium-low and add the white pepper, thyme and Worcestershire, and simmer for 8 to 10 minutes. Add the clams and potatoes, and cook to heat through slowly, allowing all flavors to blend together. Serve hot.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.