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First, prep the potatoes. Put them, one at a time, onto a wooden spoon and, starting at one end, cut across their width at 3mm intervals with a chef’s knife – the spoon will stop you from cutting all the way through the potato.
Once all the potatoes are prepped, heat oven to 200C/180C fan/gas 6. Put the butter and oil in a roasting tin over a medium heat to melt the butter. Tip in the potatoes, season, and scatter over the oregano. Give the potatoes a good toss so they’re coated, then roast on the bottom shelf of the oven for 45 mins-1 hr until golden and tender.