Cook the spaghetti in salted water until al dente.
Wash the lemon, squeeze it and grate the peel.
Salt and pepper the salmon and sear it in a hot pan in oil on both sides.
Remove from the pan and set aside, covered.
Remove stem from cherry tomatoes and sauté in pan for 1 minute. Add lemon juice and zest and cook for another minute, then add squid ink and dilute with a little pasta water.
Reduce slightly over low heat for 2-3 minutes. Season to taste with salt.
Strain the spaghetti and add to the sauce.
Arrange the spaghetti, place the salmon on top and garnish with fresh basil leaves.