Using a dry measuring cup, scoop 1 cup of quinoa into a fine-mesh basket strainer. Rinse the quinoa thoroughly with cold, running water. Quinoa can be coated in a bitter-tasting, powdery resin, so it is important to give it a good rinse. When the water runoff turns from cloudy to clear, your quinoa has gone through sufficient rinsing. Set aside.
Using a wet measuring cup, add chicken stock to a medium saucepan. Stir in butter and gray salt. Bring stock to a boil over medium-high heat.
Add rinsed quinoa, stirring to combine. Return the mixture to a boil, then cover and reduce the heat to low. Simmer the quinoa until all of the liquid is absorbed (15 – 20 minutes). Remove from the heat and let sit for 2 minutes.
Finish by fluffing the quinoa with a fork.