Start with 1 1/2 pounds shrimp in shells; peel and devein shrimp, leaving tails intact for a more dramatic presentation.
You may also use a roasting pan that you don't mind getting messy or two 13 1/2x9 1/2x3-inch disposable foil pans stacked together to form one pan. If using foil pan, grilling times will increase. Allow about 30 minutes for the first covered grilling time and about 10 minutes for the second covered grilling time.
Insulated cooler with ice packsLarge on-site grill (with a cover)Extra-large cast-iron skillet