Blackened salmon is great in a sandwich with a spread of mashed avocado and low-fat mayonnaise plus peppery arugula leaves, cool tomato slices and zesty red onion. We grill our cajun-style salmon so there is no need for any added cooking oil. Catfish makes an excellent stand-in for the salmon but you'll want to use a grill basket if you have one to keep the fish from breaking apart.