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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.
Carefully spread the sweet potatoes out in a single layer on the baking sheet. (Watch out, the pan is hot!) 5 Bake: Bake for a total of 15 to 25 minutes. After the first 10 minutes, remove the baking sheet from the oven and use tongs to turn over all of the sweet potato pieces. Return to the oven and bake for another 5-15 minutes, or until they are well browned. Cooking time depends on the temperature of the oven (500F will need less cooking time than 450F) and the size and thinness of the sweet potato wedges.