Juice the limes and lemons, removing any seeds. Set aside.
Bring a pot of water to a boil. Add the shrimp and cook for 2–3 minutes, or until they just turn pink and opaque.
1 pound shrimp
Immediately transfer the shrimp to a bowl of ice water to stop the cooking. Once cooled, drain and chop into bite-sized pieces if desired.
In a large bowl, combine the shrimp, lime and lemon juice, red onion, aji or habanero, cilantro, and grated ginger. Stir gently to combine.
1 cup freshly squeezed lime juice, 1 cup freshly squeezed lemon juice, 1 small red onion, ¼ cup finely chopped aji pepper or sliced habanero, ½ cup fresh cilantro, 1 teaspoon fresh ginger
Cover and refrigerate the ceviche for about 30 minutes to let the flavors meld.
Serve chilled, with tortilla chips, over tostadas, or in lettuce cups.