Yes you can though to ensure it's properly 'cooked' by the acid marinade in the recipe we recommend parboiling the shrimp first or allow the shrimp to sit in citrus juice separately for 15-30 minutes before adding it to the ceviche recipe. To parboil: Bring a large pot of water to boil, add the shrimp and cook for 1-2 minutes in the boiling water (the shrimp will turn opaque white when cooked). Immediately place in an ice bath (a bowl of cold water and ice) to stop the cooking process so the shrimp do not become rubbery in texture.