Fry the onions in the olive oil for 10 minutes
Add the garlic for 1 minute
Add lardons for 2 minutes then add the chopped celery, potatoes and courgettes and herbs
Add stock and bring to the boil then lower heat and simmer for 30 minutes
Meanwhile fry remaining lardons and set aside along with some of the feta, parsley and dill to garnish
Add the feta and whizz with a stick blender
Add black pepper to taste, you shouldn't need salt as the feta is already salty.
Serve with the prepared garnish