Preheat the oven to 500°F. Place the beets on a rimmed baking sheet and roast for 75 minutes or until the outsides are completely charred and the insides feel like soft butter when you insert a knife into them. Let cool.
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Peel off the beet skins with your hands or a pairing knife, leaving a little of the char on to add flavor. Cut into small cubes, and toss in a mixing bowl with the salt, olive oil, cumin, and preserved lemon paste. Taste and adjust seasoning as desired.
