Hot And Sour Shrimp With Watercress And Walnuts

• 8 green onions
• 2 bell peppers
• 2 garlic (cloves)
• 1 squares
• 1 long this excellent recipe is a relatively quick (pieces)
• 425 gr shrimp (uncooked)
• 90 ml peanut oil
• 120 ml chicken stock
• 60 ml dry sherry
• 60 ml sherry