1. Bring a large pot of water to a boil. When water is boiling, add 1 tablespoon salt and pasta; stir to separate pasta. Cook pasta until al dente; drain. Pour evaporated milk into empty pot and simmer over medium-high heat until reduced to ¼ cup. Add cooked pasta to pot and stir to combine.
2. Adjust oven rack to upper-middle position and heat broiler. Line a baking sheet or pan with aluminum foil. Season skinless side of salmon liberally with salt and pepper, sprinkle with zest, then rub with olive oil. Broil until salmon is no longer translucent and is firm when pressed, about 10 minutes. Remove from broiler and sprinkle with lemon juice. Use fork to flake into bite-sized pieces. Skin will stick to foil and can be discarded.
3. Add salmon to pasta mixture and stir over medium heat until hot. Remove from heat and stir in basil. Top with parmesan.