Over a low temperature melt butter and cook onions until soft. Do not brown
Stir in flour and cook for two minutes
Slowly add 1 cup of milk and stir until sauce is thick
Stir in mustard
Slowly add remaining milk
Add Bay leaves, salt and black peppers
Cook over low heat for 10-15mins. Stir in parsley
This can be used as a sauce for boiled potatoes, cauliflower bake, fish, chicken, pork.Hint: par-boil cauliflower, drain. Place in oiled dish. Pour over onion sauce. Top with grated cheese. Cook in moderate oven for 20mins. Hint: Add a small can of tuna drained. Serve with cooked pasta. Top with grated parmesan cheese.Hint: Add one quarter cup of cream, a handful of sliced mushrooms, one cup of shredded cooked chicken. Over low heat cook for 2 mins. Serve with hot rice.