Shrimp cocktail makes a summery appetizer or party dish, and I love to add lobster or crab into the mix. Tie your choice of seafood together with a mango cocktail sauce that’s bright, lightly sweet, and as spicy as you prefer. Here I use both horseradish and serrano pepper for different types of heat, and both ingredients can be adjusted to your preference. What you won’t want to skip is the ripe mango puree that lends essential flavor. After juicing limes for the cocktail sauce, save the halves as they will be needed for poaching the shrimp. If you have lemons, oranges, or other citrus on hand, feel free to…