Mash the nduja, garlic, and lemon juice into the soft butter until smooth.
Pat the shrimp dry and season lightly with salt.
Grill or pan-fry the shrimp over high heat, about 2 minutes a side, until pink and opaque.
Off the heat, add the nduja butter to the hot pan and toss the shrimp so the butter melts into a sauce.
Finish with parsley. Serve with bread to mop the pan.
Notes
Nduja (say "en-DOO-yah") is a soft, spreadable spicy Italian salami.Serving note: the same butter is wonderful melted over grilled corn or new potatoes.