What is clamshell casino poker chips? A clamshell is simply a thin hard shell that protects the inside of a casino chip. When it is open, the chips look like they are solid and when they are closed, they resemble a clam. The best way to eat clams casino dip as is. If you’re going to try this recipe with fresh clams, just use the small ones instead of the larger dried ones. Dried clams have a strong flavor so it’s best to reserve them for a dip or side dish. Most recipes for the standard casino chips already include clams in some form, whether as a topping or in a marinade. What is clams casino dip? This dish is simple and quick to make.