I recently had the best lobster roll of my life, and then by some miracle, found the recipe online :D This works with both lobster chunks, crab chunks, or shrimp.
First, the spices. You want each of these in equal measurements (1/4 tsp each = 4 servings).
Then, the butter. Melt one stick of butter down, and brush the sides of four split hotdog buns, like these:
Once buttered, stick them on the grill to toast them up. Take the remaining butter and squeeze a quarter of a lemon in it.
Once you have the buns toasted, spread a thin amount of mayo (trust me, a lot isn't needed here) on the inside of the bun. Put your lobster/crab/shrimp in the bun, and drizzle the butter over it. Dust with the spices (again, not much is needed here).
These are the BEST lobster and shrimp rolls I've ever had. I go to bed dreaming about these! Ok, not really, but they are seriously damn good. I prefer the lobster, of course, but the shrimp is damn tasty.