Summer veg coleslaw with coriander.

1 fennel bulb finely chopped 5 spring onions finely chopped 2 tbsp finely chopped coriander 4 celery stems finely chopped 1 apple cored & finely chopped 1 tsp fennel seeds 1 tsp Dijon mustard 1 tbsp apple cider vinegar Zest & juice of half a lime 150g natural yoghurt