Use 2 tablespoons of the vegetable stock to sauté the green onions for 3-5 minutes, until they soften.
Add the peas, cream, remaining stock, nutritional yeast, garlic, tarragon, salt, and pepper. Bring to a simmer and adjust heat to maintain a simmer. Cook a few minutes until reduced to a sauce like consistency.
Meanwhile, cook the pasta in a large pot of boiling salted water until al dente. Drain.
Transfer the cooked pasta to the skillet with the sauce and toss well.
Serve with a garnish of fresh parsley, pine nuts, and smoked sea salt.