Greek roast lamb

If spring is in the air you don't want to be slaving over a hot oven, so make the most of seasonal lamb the easy way with this lazy roast

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1 large leg of lamb, about 3kg/6lb 8oz

6 garlic cloves

1 bunch oregano

zest and juice 1 lemon

6tbsp olive oil

1 1/2kg new potatoes

400g can chopped tomato

large handful pitted baby kalamata olives