In a large kettle melt 1 stick butter and add chopped onions, saute until done then add chopped carrots, celery, potatoes, saute for ten min. then add thyme,salt and black pepper,saute for 10 more min.. Add 1 qt.saved clam juice, cook veg. until tender. In a seperate pan melt 1 stick butter,whisk in flour cook for a couple min. then add 1 cup of soup broth mix together then add half and half, whisk altogether add to chowder then add clams. Cook on simmer until heated through. Start to finish took me 2 hours.