01 - Rinse the quinoa under cold water. In a medium saucepan, combine quinoa, water, and 1/2 teaspoon salt. Bring to a boil, reduce heat, cover, and simmer for 15 minutes or until water is absorbed. Remove from heat, fluff with a fork, and let cool to room temperature.
02 - While the quinoa cools, prepare the citrus: segment the orange and grapefruit over a bowl to catch any juices. Set segments aside; reserve 2 tablespoons of the juices for the dressing.
03 - In a small bowl, whisk together olive oil, honey (or maple syrup), vinegar, lime zest and juice, reserved citrus juices, salt, and pepper.
04 - In a large bowl, combine cooled quinoa, citrus segments, diced avocado, red onion, cilantro, and mint (if using). Drizzle with dressing and gently toss to combine.
05 - Top with pumpkin seeds or sliced almonds and crumbled feta (if desired). Serve immediately, or chill for 30 minutes to allow flavors to meld.