Chicken and Lemon Tagine 50 g/2oz butter 8 approx boneless chicken thighs 2 onions (finely chopped) 3 garlic cloves (finely chopped) 5 cm/2in piece root ginger (grated) 2 cinnamon sticks 2 tsp ras-el-hanout (North African spice blend) ½ tsp ground turmeric ½ tsp ground cumin or cumin seeds 2 tsp ground cinnamon 6 small preserved…