Place quinoa in a fine sieve; rinse with cold water, and drain.
Heat oil in a large saucepan over medium-high heat. Add garlic; sauté 30 seconds. Add onion; sauté 4 minutes or until tender. Stir in water, quinoa, and salt; bring to a boil. Cover, reduce heat, and simmer 15 minutes or until liquid is absorbed and quinoa is tender. Remove from heat; fluff with a fork.