Larsen’s Seafood Market is in Menemsha, on the island of Martha’s Vineyard. Betsy Larsen — who owns this wonderful market — shared this recipe. Last summer, I learned an important lesson when I decided to make this Vineyard clam chowder recipe. Well, it looked beautiful, but it tasted like a sand bar. (I’d thought I would be clever, and used the water that I soaked the clams in for the broth. Big mistake! Be sure to soak and rinse the clams thoroughly, and do not use the leftover liquid!) On the Vineyard and throughout the Cape Cod area, strained frozen clam juice is usually available from the local fishmongers.