Chop all the vegetables to the same size

In a large pot put enough olive oil and fry the onion, celery, leek and carrot.

Add some salt and stir

Add the rosemary

After the vegetables wither, add the garlic

Then add the potatoes and thyme

Add boiling water, season with salt and pepper and simmer for half an hour

Blend the soup and add a little olive oil or butter