Melt butter in a saucepan over medium heat. Add the quinoa, and toast, stirring occasionally, until lightly browned, about 5 minutes. Stir in broth, and bring to a boil. Reduce to a simmer, cover, and cook for 15 minutes, or until quinoa is tender.
In a bowl, toss quinoa together with garlic, parsley, thyme, salt, and onion. Sprinkle with lemon juice, and serve.