When ever we have a BBQ I make a mushroom and beer gravy,
melt a tablespoon of butter in a saucepan, half fill the pot with sliced mushrooms, I like the big field mushrooms as they have alot more flavour, sautee for about 3 min on a low heat add salt and pepper to taste. Open your favourite beer and pour 1/2 a stubbie over the mushrooms ( not stout it ends up too bitter) simmer for about 5 min. mix 2 tbls of gravox ( or any other gravy mix) with 1/2 cup of water and slowly pour into mushroom mix will stirring quickly until thickened. Ladel heaps over your steak.
Andrew