Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1      pound         smoked cod
     1/2  pound         onions
     1/2  pound         shelled peas
  10      fluid ounces  milk *
   1      ounce         flour
   1      teaspoon      dry mustard
   1      ounce         butter
   2      pounds        mashed potato

Preparation:

* (or substitute 5 oz milk and 5 oz cream). Chop onions roughly and fry in butter until tender. Remove from heat an stir in flour and mustard. Add milk. Return to heat and stir until thickened. Add cod, cut into 1/2-inch cubes, and peas. Turn into ovenproof dish and cover with mashed potatoes. Bake in a moderate oven at 400F/200C, for 35-45 minutes, or until golden brown. (Though not traditional, the addition of 2-3 oz of cheddar cheese to the sauce makes this an extremely tasty dish.)