Using a heavy pan with a tight-fitting lid, bring 2 cups of chicken stock to a boil. Stir in couscous, turn off heat, put the lid on the pan and let it sit for five minutes without lifting the lid.
While couscous cooks, thinly slice the green onions and measure 1/2 cup finely grated Parmesan cheese.
After 5 minutes, remove lid and fluff the couscous with a fork. Let cool for 2-3 minutes.
Stir in green onions and finely-grated Parmesan. Season to taste with freshly-ground black pepper and serve hot.