Hailing from the British Isles, crumpets are small, yeast-raised breads about the size of an English muffin. They're made in crumpet rings (also called english muffin rings), which are 4 inches in diameter and about 1 inch deep. The rings are made of stainless steel and typically sold in packages of four at gourmet kitchenware shops. If you can't find them, substitute scrupulously clean 61⁄8-ounce tuna cans with tops and bottoms removed. The unsweetened crumpet batter is poured into the crumpet rings (which have been arranged on a griddle), then "baked" on a stovetop. The finished crumpet has a smooth, brown bottom and a top riddled with tiny holes. Crumpets are toasted whole (unlike english muffins, which are split) and spread with butter or clotted cream and jam, as desired.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.