2 Little Gem lettuces, leaves separated, rinsed and dried, to serve
1 ripe avocado (about 150g/5陆oz), stoned, peeled and sliced, to serve
2 garlic cloves, crushed or finely grated
2 large limes, zest and juice only
1 orange, zest and juice only
1 red onion, finely sliced
2 tbsp Mexican hot chilli sauce
1 tsp freshly ground black pepper
1 tbsp caster sugar
1 tsp ground cumin
1 tsp dried oregano
1 tbsp white or red wine vinegar
1 tsp flaked sea salt or 陆 tsp fine salt
2 tbsp tomato pur茅e
soured cream or reduced-fat cr猫me fra卯che, to serve
6 boneless, skinless chicken thigh fillets, fat trimmed
4 corn tortillas, warmed, to serve