01 - Rinse the quinoa thoroughly under running water. In a medium saucepan, combine quinoa, water, and salt. Bring to a boil, reduce heat, cover, and simmer for 15 minutes, or until the water is absorbed. Remove from heat, fluff with a fork, and let cool.
02 - Bring a large pot of salted water to a boil. Blanch the asparagus, sugar snap peas, and peas for 2 minutes, until just tender and bright green. Drain and immediately transfer to a bowl of ice water to stop the cooking process. Drain well.
03 - In a large bowl, combine cooled quinoa, blanched vegetables, radishes, cherry tomatoes, red onion, parsley, mint, and chives.
04 - In a small bowl or jar, whisk together olive oil, lemon juice, Dijon mustard, honey, garlic, salt, and pepper until emulsified.
05 - Pour the vinaigrette over the salad and toss to combine thoroughly. Adjust seasoning to taste.
06 - Transfer to a serving platter or bowl. Sprinkle with feta cheese if using. Serve immediately or chill for up to 2 hours before serving.