Heat oven to 200C/fan 180C/gas 6. Tip the
potatoes into a large pan of boiling water,
wait for the water to boil again, then cook for
5 mins. Drain, tip back into the pan and shake
well to rough up the edges a little. Tip onto
a baking tray, toss with the lemon zest, oil and
some flaky sea salt, then roast for 30 mins
until golden and crisp.