1. Three hours before you plan to grill the crabs, whisk the lime juice, tequila, garlic, jalapeño pepper, and coriander together in a small bowl. Gradually whisk in the oil, then season to taste with salt and pepper. Place the crabs in a single layer in a shallow bowl. Pour the marinade over the crabs. Cover the bowl and let marinate in the refrigerator for 3 hours.

2. Prepare charcoal or wood chips for grilling.

3. When the coals are quite hot, remove the crabs from the marinade and place them 3 to 4 inches from the heat. Grill just until cooked through, 2 to 3 minutes each side. Transfer the crabs to a serving platter and drizzle with some of the marinade. Serve at once.