Keep frozen. How to Prepare: Oven: Toss frozen beets with a little olive oil, salt and pepper. Place in a single layer on a pan and roast at 350 degrees F for 15-20 minutes. Microwave: Place frozen beets into a covered microwave-safe dish. Cook on high for three to four minutes. Microwave heating times may vary. Season to taste. Store at or below 0 degrees F (-18 degrees C). For food safety and best quality, cook to a temperature of 160 degrees F (71 degrees C). Cooking times may vary depending on power of microwave and type of container used. To return highest quality and texture, do not overcook.