Chilled Pea Soup

• 1 bunch watercress
• 1 onion (chopped)
• 1 in a food processor
• 1,500 gr peas unshelled (fresh)
• 600 ml nonfat chicken broth
• 60 ml cream
• 26 gr butter (unsalted)
• 2 gr basil (fresh chopped)
• 3 slices bacon crisp (fried)
• 1 slice potatoes unpeeled (white)