Heat the remaining 1 tablespoon of oil in a large saucepan. Add the quinoa and cook over high heat, stirring, until light golden and fragrant, 3 to 4 minutes. Add the water and 3/4 teaspoon of salt and bring to a boil. Cover and cook over low heat until all of the water has been absorbed and the grains are tender, 12 to 15 minutes. Fluff the quinoa with a fork and stir in the onions. Season with salt and pepper. Transfer the quinoa to a bowl and serve at once.