Harvard Beets for the Freezer (or Right Away) from Food.com: The only way to eat beets! When I harvest my beets in the fall I always make up a few batches of this for the freezer-they're just as good reheated and it's a wonderful quick veggie for winter! To prepare fresh beets, I cover them with water, cook for 30 minutes to an hour till tender, then peel and cube. This recipe is a Swedish family tradition. The long cooking time includes the time the beets need to marinate.