For nearly 700 households that rely on the Family Pantry of Cape Cod each week, one item has emerged as a clear favorite: haddock chowder made with help from local fishermen. The popular meal also shows how a local partnership can stretch food budgets while getting a highly sought-after source of protein to families who need it most. Here's what to know According to the Cape Cod Times, the most sought-after item at the Harwich-based Family Pantr…