Inspect the filet to make sure it is fresh and free of scales and pin bones.
Pat the filet dry with paper towel.
Slice filet into two pieces if necessary.
Season the fish with a pinch of salt and a grind or two of freshly cracked black pepper.
Preheat the 12" Large Skillet over medium heat.
After 2 minutes it should be hot enough that water droplets will dance across the surface.
Place each of the salmon filet(s) skin-side down in the sauté pan. You should hear a definite sizzle.
Cover and cook over medium heat until steam just begins to escape from under the lid.
Spin the lid to engage the Vapor seal.
Cook for 2 minutes.
Remove the pan from the heat.
Allow the pan to rest for 7 minutes.
Cool salmon completely.
Crumble the fish into a large bowl. Discard the salmon skin.
Add the scallions, celery, parsley, mayonnaise, lemon zest, and lemon juice. Mix gently to combine.
Taste, then adjust seasoning with salt and pepper
Slice hot dog buns end to end from the top. Try not to slice all the way through the bun.
Place the buns on the Large Cookie Sheet.
Toast the buns under the broiler on each side until golden brown.
Fill each bun generously with the salmon mixture.
Top each sandwich with crispy iceberg lettuce. Serve.