Cook the quinoa in 1 cup boiling water in a small saucepan, covered, for 15 to 20 minutes, until all the liquid has been absorbed. Bring a pot of salted water to a boil and cook the peas until tender, about 2 minutes. Drain, submerge in ice water to cool quickly, and mash with a fork. Combine the quinoa and mashed peas with the parsley, onion, lemon juice, oil, mint, Aleppo pepper, and a big pinch of salt in a medium bowl. Toss to combine and serve.