2 Little Gem lettuces
2 Granny Smith apples (approx. 250g/9oz)
3 celery sticks, cut into 5mm/¼in slices
150g/5½oz red seedless grapes, halved
½ lemon, juice only
3 tbsp mayonnaise
1 tsp French mustard
sea salt and freshly ground black pepper
80²µ/2¾´Ç³ú walnuts
100²µ/3½´Ç³ú Stilton, crumbled
3 tbsp Greek-style yoghurt