I may be hip deep right now in baking and taco bar prep for this weekend, but having made this for myself a few days ago, I could use some ideas!
There's a dish I make for myself frequently. I saute onions and mushrooms in butter till soft and golden, but not really caramelized. Oh, a bit of garlic in there, too, but just a little. I remove the veg and then add either thinly sliced chicken, pork or beef. When that's finished, I add back the mushrooms/onions, then heavy cream and a bit of Better than Bouillon, chicken if chicken or pork, beef if beef. Let it all reduce then serve over whatever I'm in the mood for.
Now, here's the problem. If I use pork or chicken, I also add thyme and maybe a bit of mustard. I don't like the thyme/mustard with beef but haven't come up with anything else. I mean, it's good as is but I'd like an extra level of flavor.
Maybe a bit of tomato paste? Horseradish? Chopped parsley? Most herbs don't really go with beef (for my palate.)