Traybake chicken caesar salad

Ingrediënten

• 6 chicken thighs, skin on and bone in (about 800g)
• 1 lemon, very thinly sliced (1–2mm thick)
• 2 tbsp olive oil
• 2–3 heads of sweet cos lettuce (or romaine), quartered lengthways (400g)
• Handful of croutons, shop-bought or homemade, to serve
• Dressing
• 120g mayonnaise
• 85ml buttermilk or kefir
• 1 tsp dijon mustard
• 2 spring onions, finely chopped
• ½ tsp onion granules
• ½ tsp garlic granules
• 15g parmesan, finely grated, plus extra to serve
• 15g dill, finely chopped, plus a few sprigs to serve
• Fine sea salt and black pepper