Cook the pasta in plenty of salted water for the time indicated on the package.
2.
Meanwhile, prepare the stuffing: mix the ricotta, the grated pecorino, the lemon juice and zest of half a lemon and about ten chopped mint leaves and half portion of sweet peas in a salad bowl.
3.
Add Salt and pepper to your liking.
4.
When the pasta is all done , drain it and stuff it.
5.
Heat little olive oil in a pan ,Add the remaining peas, pepper, pesto sauce the lemon zest from the other half of the lemon and toss the stuffed Shells for 2 minutes.