Prepare your salmon by squeezing lemon juice all over. Place the salmon either on the grill or in a grill-pan and cook on medium heat until the salmon is fully cooked. Set aside.
Prepare your pasta by following the directions on the package.
In a large skillet, add in your butter, garlic, salt and pepper. Whisk until the butter is fully melted. Cook on medium heat for 10 minutes. Add in the flour and whisk. Cook for another 5 minutes.
Add in your milk and heavy cream. Cook for 5-6 minutes on low-to-medium heat and whisk occasionally.
Mix the pasta with your sauce, top the sauce with salmon chunks.