For a richer flavor, try roasting the beets instead of boiling them. Wrap them individually in foil with a drizzle of olive oil and roast at 400°F (200°C) until tender, about 45-60 minutes. Feel free to adjust the amount of horseradish in the dressing to your liking. A little goes a long way! This salad is delicious served immediately or chilled. It can be stored in the refrigerator for up to 2 days.