Roasting the chicken over the vegetables gives them extra flavour as they mingle with the roasting juices, but you can cook a separate portion in a foil parcel or separate tray, if needed for vegetarians. The spice rub makes some extra, so keep this to use on barbecued meats and vegetables, stored in a sealed jar at room temperature, for up to 1 month.
Step 1Preheat oven to 200°C (180°C fan) mark 6. In a small bowl, mix all the ingredients for the spice rub with 1½tsp fine salt. Put the potatoes in a medium-large roasting tin and toss through 1tbsp oil and 2tsp of the spice rub. Spread into a single layer.
Step 2Put the chicken breast-side down on a board. Using sturdy kitchen scissors, cut along each side of the backbone and discard. Turn chicken over and press down hard on the breast to flatten it (you should hear it crack). Pat dry with kitchen paper.
Step 3Stir ½ the remaining spice rub into the melted butter and brush all over the chicken. Arrange breast-side up on a sturdy metal/cooling rack (that fits above the potato roasting tin) and position on top of the tin.
Step 4Roast for 35min. Remove chicken and potatoes from oven, add tomatoes and lemon wedges to the tin and drizzle over remaining ½tbsp oil. Position chicken above the tin again and return to the oven for 10-15min, or until the chicken is cooked through and the potatoes are tender.
Step 5Remove from the oven and leave to rest in a warm place for 10min. Transfer chicken to a board and the potatoes, tomatoes and lemon wedges to a serving dish. Serve.
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