Cook the quinoa: place the quinoa in a 2 quart saucepan with the chicken broth. Bring to a boil, stir well, cover and reduce heat to low. Cook over low heat for 12 minutes, then take off the heat and let the pot sit, covered, for 3 more minutes. Fluff the quinoa with a fork, and then let sit, covered, in a warm place.

Sauté the onion, celery, pepper, and sage in the olive oil over medium heat for 5 minutes. Add the garlic and sauté over medium heat for 30 seconds to a minute, until fragrant.

Combine the quinoa, sautéed vegetables, and walnuts. Mix well and taste; add salt to taste.