Rinse your quinoa. This removes the natural, and bitter outer coating of the quinoa.
In a large skillet, heat up a few tablespoons of oil. In another smaller frying pan, heat up another few tablespoons. Place the garlic in the skillet, and sauté until cooked. Wait for the pan to cool first, then add the water and quinoa. Turn up the heat. Once the water boils, bring the heat down until the water is lightly simmering, and cover the pan.
While the quinoa/water is simmering, place your onions and sugar in another pan. You're aiming to caramelize the onions, which takes a while. Sauté vigorously until the onions are golden-brown. Once caramelized, add the onions to the still-simmering quinoa.
By now the quinoa should have soaked up most of the water. Keep simmering until all the water is absorbed, which should take around 15-20 minutes. Once all the water is absorbed, the quinoa should have a whiteish ring around it and the inside should be clear, and mostly not crunchy. If not, you may need to add more water and continue simmering.
Add in the salt and pepper once done. Place the quinoa in a large bowl, then mix 1 cup of the Parmesan, reserving 1/4 cup for garnishing (hot pan + melty cheese = hard to clean).
Plate it up, sprinkle your cheese on for garnish, and enjoy your creamy delicious oniony goodness.