To cook the beets, fill a 2 quart pot with 4 cups water and bring to a slow boil. Peel beets. Dice into ½ inch cubes. Carefully place beets in slowly boiling water until tender, about 15-20 minutes. Check beets are tender by poking with a fork. Drain beets. Rinse with cool water, and drain again.In a food processor puree garbanzo beans, beets, olive oil, tahini, lemon juice, garlic, salt, pepper and ¼ cup water.Pulse ingredients in food processor slowly adding water until the desired consistency is achieved.