Slice courgettes and place them in a single layer on the baking tray.
Spray a bit of cooking oil on the courgettes and rub in smoked paprika and garlic powder.
Set the oven to 180C and roast courgettes for 15 - 20 minutes in the oven. (see *note 2)
At the same time, finely chopped onions, celery and mint.
Heat the oil in the saucepan, add chopped onions, and fry until the onion is soft.
Add spring onion. Add a splash of vegetable stock if the pan gets too dry.
Add chopped celery, celery leaves and mint and fry for a minute.
Add peas.
Add roasted courgettes and mix them well with the ingredients in the pan.
Add vegetable stock. (see *note 3)
Turn the heat down and put the lid on. Let the soup cook for another 10 minutes.
Turn off the heat. Once the soup cools down a bit, blend it.
Taste the soup and add salt and pepper if needed.