Heat the oven to 400°F.
Arrange a rack in the middle of the oven and heat the oven to 400°F.
If the beets still have their leafy tops, cut off the tops close to the tops of the beet, leaving yourself enough to grip.
Scrub the beets thoroughly, then wrap them loosely in aluminum foil.
The beets don't need to be dried before wrapping.
Small beets can be wrapped together, but it's easiest to roast large beets individually.
Do, however, separate the two colors (yellow and red). If they are cooked together, their colors will bleed into each other.
Place the wrapped beets on a baking sheet to catch drips if the beet juices leak.
Roast for 50 to 60 minutes.
Beets are done when a fork or skewer slides easily to the center of the beet. Therefore, small beets will cook more quickly than large beets.
Remove the beets from the oven and set the beets aside until cool enough to handle.
I recommend using gloves so your hands don't turn red with the beet juice.
Hold one of the beets in a paper towel and use the edges of the paper to rub the skin away.
The skin should peel away easily; if it doesn't, the beets likely need to cook for a little longer.
Peel the remaining beets and slice them thin into bite-sized pieces.