Cut off the root of the leek and trim dark green part, slice lengthwise and then cut crosswise into 1 inch long pieces. Wash the leeks with cold water, scoop them out with a sieve.
Heat 3 tbsp of the oil and sauté leeks until tender, about 5 minutes.
Add pumpkin seeds and stock, season with salt and pepper.
Let boil for 20-25 minutes. Cool slightly, play safe and process in the blender, you have to work in batches. Remove centre piece on the lid but keep cover with a tea towel so the steam can escape.
Adjust thickness of the soup; you will probably need more liquid.
Reheat and serve with pumpkin seeds and pumpkin seed oil.
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