Cook the pasta: Cook the pasta in salted water until al dente, about 9 minutes, according to the package instructions.
Add the peas: Add the peas during the last 3-4 minutes and cook them along with the pasta.
Drain: Drain the pasta and peas, reserving a little of the cooking water.
Stir in the pesto & arugula: Mix the arugula pesto and a handful of arugula into the still-warm pasta. If needed, add a few spoonfuls of pasta water to make everything nice and creamy.
Toast the pine nuts: In a small pan, dry-toast the pine nuts for 2-3 minutes until they take on some color.
Serve: Serve with pine nuts or vegan parmesan and freshly ground black pepper.