In a large bowl, mix the scallops, green onions, cilantro, ginger, and lime juice until well combined. Cover and refrigerate for at least 1 hour. Remove the scallop mixture from the refrigerator and mix in the mango until well combined. Divide the butter lettuce leaves equally among 4 plates. Divide the scallop mixture evenly over top the lettuce and serve immediately.
Recipe courtesy of Juan-Carlos Cruz