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Blitz the tomato purée, vinegar, paprika, date, oil, garlic and 2-3 tbsp water until smooth. Slash the drumsticks a few times, then toss in the sauce. Heat the oven to 200C/180C fan/gas 6, then roast for 30 mins.
To make the dressing, scoop the avocado into a bowl with the yogurt, lemon juice, spring onions, tarragon and mustard powder, then blitz with a hand blender until smooth.
Toss the lettuce, watercress and cucumbers together and pile onto plates. Spoon over the dressing and serve with the chicken and potatoes.