Fresh littleneck or cherrystone clams work best and should be scrubbed well to remove any sand. Keep the clam broth for added flavor. Avoid boiling after adding dairy to prevent curdling. This chowder tastes better the next day as flavors meld. For variations, try vegetarian, spicy, smoky, or dairy-free versions as suggested. Store leftovers in the refrigerator for up to 3 days or freeze for up to 2 months, reheating gently to maintain texture.