Start by rinsing 1/3 cup of uncooked quinoa under cold water. In a medium saucepan, add the rinsed quinoa and 2/3 cup of water. Bring to a boil, reduce heat, cover, and let simmer for about 15 minutes. Fluff with a fork and set aside to cool.
While the quinoa is cooking, wash and chop your kale into bite-sized pieces. Remove any tough stems. Place the chopped kale in a large mixing bowl.
Dice your semi-sweet apple and add it to the bowl with the kale. Toss in the toasted walnuts.
In a small bowl, whisk together the olive oil, lemon juice, maple syrup, mustard, minced garlic, sea salt, and pepper until well combined.
Add the cooked quinoa and hemp hearts to the bowl with the kale, apples, and walnuts. Drizzle the dressing over the top and toss until well coated.
Transfer the salad to a serving dish and enjoy immediately or chill in the refrigerator to meld the flavors.