1 avocado, chopped
2 sticks celery, very finely sliced
handful freshly chopped herbs, such as coriander, mint, basil
1 lime, zest and juice
1 red onion, finely sliced
100g/3½oz watercress or similar salad leaves
250g/9oz mixed tomatoes, roughly chopped
50²µ/1¾´Ç³ú tomatoes
400g/14oz tin black beans, drained and rinsed
splash Worcestershire sauce (or a similar vegetarian alternative – see tip)
salt and freshly ground pepper
1 tsp chipotle chilli paste
2 tbsp olive oil
1 tsp sherry vinegar