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Wash the beets gently, making sure that you donât tear the skins, then place in a pan of warm water, bring to the boil, reduce the heat and simmer until tender â around 20â30 minutes. Alternatively, you can steam whole beetroot or bake them in the oven for 2â3 hours at 150Â°C/gas mark 2.ash the beets gently, making sure that you donât tear the skins, then place in a pan of warm water, bring to the boil, reduce the heat and simmer until tender â around 20â30 minutes. Alternatively, you can steam whole beetroot or bake them in the oven for 2â3 hours at 150Â°C/gas mark 2.
5 Bake for a total of 25 to 30 minutes. After the first 15 minutes, remove the baking sheet from the oven and turn over all of the sweet potato pieces.Return to the oven and bake for another 10-15 minutes, or until they are well browned. Let cool for 5 minutes before serving. Bake for a total of 25 to 30 minutes. After the first 15 minutes, remove the baking sheet from the oven and turn over all of the sweet potato pieces.