450g leeks, trimmed and washed 1kg small potatoes, scrubbed and dried 1 tbsp oil 25g butter 1 teaspoon black peppercorns 2 teaspoons coriander seeds 1 teaspoon sea salt
1) Slice leeks into 2cm rings. 2) Cut potatoes into 1cm slices. 3) Melt oil and butter in roasting tin in oven. 4) Add leeks and potatoes, turning several times to coat. 5) Crush peppercorns with coriander seeds. 6) Add the salt. 7) Sprinkle evenly over potatoes and leeks and stir through. 8) Cover the tin tightly with baking foil. 9) Cook for 45 min, gas 6, 200ºC, 400ºF. 10) Remove foil. 11) Turn the potatoes and leeks over. 12) Cook for a further 30 min.