Preheat oven to 425 degrees F (220 degrees C).
Mix beets, 1 tablespoon olive oil, 1/4 teaspoon salt, and 1/8 teaspoon black pepper together on a baking sheet.
Roast in the preheated oven until beets are tender, about 40 minutes.
Mix roasted beets, arugula, walnuts, balsamic vinegar, 1 tablespoon olive oil, 1/4 teaspoon salt, and 1/8 teaspoon pepper together in a bowl until well combined.
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