Combine peas, stock and potatoes in a pot. Bring to a boil and cook for 10 minutes.
Using an immersion blender, puree.
Add buttermilk, water, lemon juice, mint, salt and pepper. Stir to combine.
Simmer for another 5 minutes, until slightly thickened.
Notes
I prefer soups that are not super thick, so I added additional water. If you prefer to keep your soup thick, you can omit the additional water.
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