I'm looking to update this treat that my dad used to make when I was a kid. I'm thinking I'll buy some good roast beef, butter and toast some crusty rolls, and maybe add a slice of horseradish cheddar. But the au jus part has me stumped. I've never made it before. Can I just spice up some regular old consomme or is there a better way to do this?
Does anyone else have a favorite way to make this?