Prep the bacon first. Heat a grill pan to medium-low heat. Once hot, place the strips onto the hot pan. Cover with a lid to avoid grease splatters. Allow to cook 3-4 minutes on each side.
While the bacon cooks, mix together the aioli ingredients in a small bowl until combined. Spread butter onto each side of sliced bread.
Prep the salmon. Cut the filet into two equal pieces and then pat dry with a paper towel. Season salmon with 1 tablespoon of blackened seasoning on each piece. Repeat to the other.
Remove the cooked bacon (and its grease) from the grill pan. If the grill pan is not non-stick, add 1 tablespoon of olive oil or avocado oil and ensure it covers the pan to avoid salmon fillet from sticking. Heat again to medium heat. Once hot, place salmon (skin side down) and allow to cook 4-5 minutes. Use tongs to flip and continue cooking until salmon reaches an internal temperature of 145F (use a meat thermometer). Turn down the heat if the salmon skin starts to burn but isn’t fully cooked yet.
Remove the salmon from the pan once cooked and using a knife, pull away the crispy skin (it should be very easy) and toss away.
Lastly, clean the skillet with a paper towel and heat again to medium heat. Face the bread buttered side downs to toast. Flip when each piece is toasted to your liking!
Build the sandwich!! Layer aioli on both interior sides of the bread, thin tomato slices, cooked piece of salmon, red onion, crispy bacon, and fresh lettuce. Put the top slice on and you have yourselves a delicious, salmon BLT!!!