Dice sweet potato into 1/2-inch cubes. Peel fresh beets (can use red, golden or a combination — please be careful with red beets because their color bleeds) and dice into 1/2 inch cubes.
Toss on a baking sheet with extra-virgin olive oil, salt, and pepper. Bake for about 40-45 minutes, tossing occasionally until the vegetables are soft.
While the vegetables are cooking, blanch the kale to reduce bitterness and soften the greens. To blanch, stir the chopped kale leaves into boiling water for 2-3 minutes, drain, then run under cold water to stop the cooking process.
Rinse 1/2 cup of quinoa (skip this step if you bought pre-rinsed quinoa), put the rinsed quinoa and 1 cup of water in a pot, and bring to a boil. Once the water comes to a boil, turn the flame down to a low heat, cover the pot, and let the quinoa simmer for 12-15 minutes or until the liquid is absorbed.
Put all ingredients for horseradish dressing in a container, put the lid on, and shake vigorously to combine. You can also use a blender, if preferred.
Combine the cooked vegetables and quinoa with the horseradish dressing. Can be served warm, room temperature or cold.