How to Make It
Combine ingredients, in order listed, in the bowl of a heavy-duty stand mixer. Beat on low speed until combined, about 20 seconds. Increase speed to medium-high, and beat 2 minutes.
Cover bowl with plastic wrap, and let stand at room temperature 1 hour. (Mixture will expand and become bubbly).
Heat a skillet over medium. Lightly grease skillet with butter; place well-greased 4-inch English muffin rings on griddle (4 to 6 at a time). Using a 1/3-cup measure, pour batter into rings, and smooth level with bottom of cup. After 4 minutes, remove rings with a pair of tongs. Continue to cook 6 more minutes, until tops are bubbly and crumpets are dry around edges. Flip crumpets, and cook other side 5 minutes. Repeat with remaining batter. Serve warm with butter, jam, or honey.