Roast beets, or use pre-cooked beets for this salad.
To roast the beets, preheat the oven to 400°F (200°C).
Drizzle the beets with 1 tablespoon of the olive oil, and sprinkle with salt and pepper. Wrap them individually in foil.
Place them on a baking sheet and roast for 45-60 minutes, or until the beets are tender when pierced with a fork. Larger beets may require additional roasting time.
Once the beets are tender, remove them from the oven and allow them to cool slightly.
Unwrap the beets and use a paper towel to rub off the skin, which should easily peel away.
Once fully cooled, slice the beets and arrange them on a plate.
In a small sealable container, add the remaining olive oil, lemon juice, apple cider vinegar, Dijon mustard, and agave. Seal the container and shake to combine.
Top the beets with toasted walnuts, feta cheese, and basil. Drizzle the dressing over the top and season with salt and pepper, to taste.