The quantities aren't particularly important here.
The technique is.
Brown the Mushrooms Before You Salt Them
Get your pan hot and add the sliced mushrooms.
Then leave them alone long enough to actually brown.
Don't salt them yet.
Salt pulls moisture from the mushrooms, and moisture is the enemy of browning. If you season them immediately, they can start steaming in their own liquid before you've developed much color.
Brown first.
Salt second.
Once the mushrooms have good color, season them with salt and plenty of freshly cracked black pepper.
Add a little Worcestershire sauce and fresh garlic.
You don't need much Worcestershire. You're looking for that savory background note, not enough to make the whole sauce taste like Worcestershire.
Then add a splash of heavy cream and a spoonful of onion jam.
Turn the heat down.
Let everything gently cook until the cream reduces and the sauce gets thick enough to cling to the mushrooms.
That's it.
The Onion Jam Is the Shortcut
The onion jam is what makes this ridiculously easy.
Ordinarily, if you wanted that deep sweet-savory onion flavor in a steak sauce, you might spend half an hour slowly caramelizing onions.
I'm not doing that on a weeknight while there's a steak on the grill.
A spoonful of onion jam gets you most of the way there immediately.
It brings sweetness, acidity, cooked onion flavor, and complexity all at once.
Combined with the mushrooms, Worcestershire, garlic, and cream, it makes a sauce that tastes much more developed than the few minutes it took to make.
Spoon It Over a Properly Grilled Steak
I made this for a New York strip cooked over a very hot open grill with salt, freshly cracked black pepper, and Italian seasoning.
That's already one of my favorite ways to cook steak.
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