Prepare the dressing: Combine the lemon juice, olive oil, honey, salt, and pepper in a jar with a tight-fitting lid or a small bowl. Shake or whisk until emulsified and set aside.
Cook the quinoa: In a small saucepan, bring the chicken or vegetable stock to a boil over high heat. Add the quinoa, reduce heat to low, cover, and simmer for 12-15 minutes, or until the quinoa is tender and the liquid is absorbed. Fluff with a fork and let cool to room temperature.
Chill the quinoa: Transfer the quinoa to a storage container, cover, and refrigerate until fully chilled. For best results, prepare the quinoa a day ahead.
Assemble the salad: In a large mixing bowl, combine the chilled quinoa, chickpeas, cucumber, red onion, parsley, mint, pistachios, and feta cheese.
Dress the salad: Drizzle with your desired amount of dressing, toss to coat, and serve immediately or refrigerate for up to 3 days.