I found this recipe in 'Garlic & Sapphires' by Ruth Reichl. I tried it & loved it. I hope I remember it correctly...it's soo easy.
Bring a pot of water & salt to a boil. Add potato. Boil until very soft, about 20 minutes.
Add watercres. When the water comes back to a boil, cook 1 minute.
Drain & press down to get all the liquid out. puree in a food processor, add butter, puree again. Season to taste.
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