TO PREPARE BECHAMEL SAUCE:
Bring to the boil milk with salt and grated nutmeg.
In a saucepan toast flour with butter, pour boiling milk, mix and cook for 15 minutes, when bechamel is lokewarm, unite it with pesto sauce and amalgamate them.
Wash and cut cherry tomatoes in 4 parts, cook spaghetti in salt water, drain them al dente and season them with prepared pesto sauce, cherry tomatoes , slivers of parmesan cheese and pinenuts left.
Source: http://www.buonissimo.org