Preheat your oven to 350°F. Place beets in a pot. Cover with water, salt and pepper. Add in 1 sprig thyme and 2 garlic cloves. Cover the pot with a lid. Place in a preheated oven for about 20 minutes or until the beets are fork-tender.
Blend all remaining ingredients till smooth in a food processor and season to taste with salt and lemon juice.