Green chicken salad

• 1 small red onion, finely chopped
• 1 lemon, juiced
• 1 small rotisserie chicken, around 250g meat, picked and shredded
• 4 sticks celery, finely chopped
• 4 spring onions, finely sliced
• ½ large cucumber, deseeded and finely chopped
• 6 cornichons, roughly chopped
• 1 green pepper, deseeded and cut into 1/2cm cubes
• large handful of soft herbs (we used dill and parsley), roughly chopped
• toasted sourdough, to serve

For the dressing

• 50g natural yogurt
• 2 tsp Dijon mustard
• 50g mayonnaise
• 50ml olive oil