1 lb Leeks, trimmed, washed &  -- sliced 2 pk Watercress, washed  1/2 oz Margarine  3 1/2 c Stock  1 ts Cornstarch  Salt & pepper Fry leeks & watercress in margarine in a large pot over a low heat for 15 minutes. Keep a lid on the pot, but stir occasionally, don't let it brown. Add stock, bring to a boil & simmer for 10 minutes. Dissolve cornstarch in a little cold water & add to the soup. Blend till smooth, reheat & serve. 
 
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