Pureed Watercress

Ingredients:
- 1 tablespoon salt
- 1 medium potato, cut into small cubes
- 4 bunches watercress (1-1 1/2 lbs)
- 4 tablespoons butter
- pepper

Directions:
- 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.