Put the oil in a large soup pot over medium heat, then add the onion and celery. Sauté for about 5 to 6 minutes, stirring often. You can cover the pot in between stirring.
Add the celery leaves (if using) and cook for another two or three minutes.
Add the broth to the onion and celery, and bring to a simmer.
Next, add the chopped potatoes and continue to simmer, stirring occasionally until potatoes are soft.
Add some salt and pepper to taste. Once the potatoes are cooked, remove from heat and blend with an immersion blender, or place in a traditional blender to puree until smooth. At this point, the soup is ready to eat. However, unless you follow a vegan diet, or someone in your family is lactose intolerant, I would advise adding one of the following, more or less, to your liking: ¼ cup heavy cream (60 ml), or ⅓ cup of half and half (80 ml), or ½ cup of milk (120 ml).
You can serve the soup as is, or with croutons, if you like.
Notes
As you can see from the photo in the post, my homegrown celery stalks are small and much more thin than store-bought celery, so you may need to use 1.5 or 2 cups of chopped celery if you use store-bought. This recipe isn't critical for measurements and cups are an awful way of gauging how much to use. I always recommend a scale.
Nutrition facts are calculated using vegetable broth and .25 cup of cream.
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