How to Make It
In a blender, combine the lime juice, clam juice, ají limo paste, garlic and celery with half each of the onion, cilantro and habanero. Blend until smooth. Strain the marinade through a fine strainer. Season with salt.
Spread the scallops in a single layer in a shallow glass or ceramic dish. Pour the marinade over the scallops. Cover and refrigerate until the scallops start to turn white, at least 1 hour and up to 4 hours.
Meanwhile, in a medium pot of boiling salted water, cook the sweet potato until tender, about 4 minutes. Transfer to a plate and sprinkle with salt. Let cool completely.
Stir the remaining onion, cilantro and habanero into the marinated scallops and season with salt. Spoon the ceviche into Chinese soup spoons or small bowls, top with the diced sweet potato and serve.
Ají limo paste is available at specialty food shops and spanishtable.com.