1. In a large bowl, combine salmon, tomatoes, onion, scallions, lime juice, pepper, and Tabasco, if using. Mix well. Refrigerate until chilled, at least 1 hour.
2. When ready to serve, cut the lettuce into leaves and wash and dry. Arrange leaves on a platter and top with chilled salmon mixture. Or, serve salmon mixture in a bowl on the side, allowing diners to place a spoonful of the salmon on a lettuce leaf and roll it. You can also roll the leaves and salmon mixture in advance, securing with a toothpick.
Source: Hannaford fresh Magazine, January - February 2011