Pureed Watercress - cooking recipe

Ingredients

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

Preparation

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.