Serve this with a Thai sweet/hot chili sauce.
Make a fire, preferably with firewood or Mexican charcoal, started from paper and kindling.
Skewer the squid. When coals are red hot, barbecue the rings for 2 to 3 minutes per side, or until they are brown.
Some recipes for grilled squid suggest marinating them.
Serve hot with lemon-garlic butter.
NOTE: Commercial charcoal and lighter fluid are petroleum products. They impart an oily flavor to food. Hardwood, or Mexican charcoal, a commercial product, which is made by burning down mesquite, both give a nice flavor and are certainly less toxic than petrochemicals.