Watercress soup

Ingredients

• 2 Tbs butter
• 1/2 c shallot or onion
• 1/3 c white wine
• 1/2 lb potato - diced
• 4 c chicken stock
• 1/2 Tbs miso paste - optional
• 4 oz watercress - chopped
• 1/2 c cream
• 1/2 tsp chicken bullion or salt
• 1/2 tsp pepper