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Stick a fork into the thickest part of the beet and if it slides off easily, they’re done. You should check the beets after about 20 minutes and sprinkle them with water (a couple tablespoons), and then re-seal the foil to finish the cooking.
To make heart shapes, you can use a marble, or a crumbled piece of foil, to place between the outside of the paper cup and the inside of each circle.