White Windsor Soup

Ingredients

• 2 oz. butter
• 2 lb. chopped potatoes
• 6 oz. chopped onions
• 6 oz. chopped celery
• 4 pt. chicken stock
• faggot of herbs (as above)
• 1 pt. milk
• 2 oz. thickener (arrowroot, flour, or constarch, blended with a little milk)
• salt & pepper
• finely chopped watercress for garnish

Instructions
Melt butter and cook the potatoes, onions and celery, covered, for 5-10 min. Do not allow to brown. Add stock, herbs, salt & pepper and simmer until vegetables are tender. Run through a sieve or put in a blender; return to pan and add milk. Bring to a boil and add the thickener. Garnish with watercress.