Preparation

• In a wide, shallow bowl, combine the flour with 1/2 tsp. salt and 1/4 tsp. pepper. Dredge the crabs to coat on both sides.
• Heat the oil in a 12-inch skillet (preferably cast iron) over medium-high heat until shimmering hot. Add the butter and swirl the skillet to melt it. Add the crabs top side down and cook, shaking the pan once or twice to keep the crabs from sticking, until browned, about 3 minutes. The crabs may pop and splatter, so stand back or use a splatter guard. With tongs, flip the crabs and cook until red and an instant-read thermometer inserted in the center reads about 145°F, 2 to 3 minutes more. Transfer the crabs to a large paper-towel-lined plate to drain briefly, then serve with the lemon wedges.