Little Gem lettuce leaves, to serve (optional)
125g/4½oz long-stemmed broccoli, trimmed and cut into short lengths (or a small head of broccoli, cut into florets)
10 cherry tomatoes, halved
198g tin sweetcorn, drained
100g/3½oz dried pasta shapes, such as fusilli or penne
2–3 tbsp mayonnaise
110–160g tin tuna steak, drained
freshly ground black pepper