Saffron Couscous

Name: Saffron Couscous
Ingredients: 1 1/2 cups couscous; 1 1/2 cups chicken stock, preferably homemade; Large pinch of saffron; Salt (optional); 2 tablespoons unsalted butter (optional); 1/2 cup currants; 1/2 bunch scallions, chopped; 1/2 cup oil-cured black olives, pitted and slivered; Freshly ground pepper