Step 1
With a large chef's knife, chop salmon using quick, even, straight-up-and-down motions (do not rock the knife or the fish will turn mushy) until you have a mass of roughly ¼-inch pieces. Transfer to a large bowl; gently stir in onion (or scallion), cilantro, ginger, ¼ teaspoon salt and ⅛ teaspoon pepper (do not overmix). Divide the mixture into 4 patties, about 1 inch thick. Chill in the refrigerator for at least 20 minutes (or up to 2 hours).