Sai Yong Choy Tong (Watercress Soup)

1 cup ripe papaya 2 bay leaves 1 onion, sliced White sauce 2 tbsp. butter or margarine 2 cups water 2 tbsp. flour 1/2 cup evaporated milk – add water to make 2/3 cup 1/2 tsp. salt; A pinch of pepper Boil papaya in bay leaves, water and onion, 10 minutes. Pass through a sieve…