I am a Brit living in Florida and brought this recipe with me when I moved here over 25 years ago - and it's still made on a regular basis.
The secret is slow cooking the meat to increase the flavour. The addition of a good beer is optional and you may not want to do this if it is for children also. This recipe has a fairly long preparation time and should be cooked a day in advance of when you plan to eat it.
A good steak & kidney pie should not be fancied up with exotic herbs, spices or vegetables. Some of my American friends have loved this pie although, on occasion, I had to substitute additional mushrooms (just before baking) for kidneys. You really don't taste the kidneys; they just enhance the flavour.