Bring liquid to a boil, stirring to dissolve salt, then remove pot from heat. Add 1 lb. jumbo shell-on shrimp, deveined, and poach, uncovered (1½–2 minutes for large shrimp, 2–3 minutes for jumbo shrimp, 3–4 minutes for super-jumbo shrimp, or 5+ minutes for colossal shrimp).
Add the shrimp; return the water to a boil and cook just until the shrimp are bright pink and the flesh is opaque (white) all the way through, about 2 minutes, a minute or two longer for unpeeled shrimp or extra-large or jumbo shrimp.
For a really great shrimp cocktail, you want to go with large shrimp. I use a 21-25 count, which means there are 21-25 shrimp per pound. Buy them deveined but uncooked. Easy-peel or already peeled is fine.
Steaming is the best method to cook shrimp because it doesn't overcook the shrimp as quickly as boiling water would.
Boil Add 1 quart of water and the salt to a large pot over high heat. Bring to a boil. Stir in the shrimp, cover, and remove the pot from heat. Let sit for 5 to 8 minutes, until all the shrimp are cooked through to a bright pink shade. Drain through a colander. Transfer the shrimp to a serving bowl or platter.
Do You Cook Shrimp With the Shells On? When Poaching shrimp, you should leave the shells on until after the shrimp are cooked. Leaving the shells on serves two purposes. One, much of the flavor of the shrimp is in the shells. Cooking the shrimp with shells on makes them taste better.
Arrange the shrimp over the ice. I added some lemon wedges for color but some guests might choose to add lemon juice to the shrimp. As the ice in the basket melts the water will filter through the holes. This will prevent the shrimp from becoming too wet or falling into the ice.