My Nana's mushroom gravy is the gravy yardstick I measure all others by. Any time I've ever asked her how to make it, she has just smiled and said, "Well, it's just gravy with mushrooms in it". I've been trying to re-create her gravy for YEARS, and I think this is about the closest I'll ever come. It IS very simple, but it's certainly not just gravy with mushrooms in it!
I started by searing seasoned pork chops in a pan with a bit of bacon fat, about three minutes per side. I had five pretty big rib and sirloin chops to do, so the pan built up a nice fond. Once the chops were seared and set aside, I added some chopped shallot to the pan and let it soften. To that, I added some chopped cremini mushrooms. A few minutes later, I sprinkled the whole thing with a tablespoon of flour (normally we avoid gluten, but sometimes you just want old-school gravy. Don't judge.), gave it a stir, and let it cook for about a minute or so. I slowly added beef stock, stirring and scraping up the bits of good stuff from the bottom of the pan. After adding the beef stock, I added black pepper and rosemary, and let the gravy come to a boil and cook for 3-4 minutes. It needed just a pinch of salt at the end, then we were ready to eat. Sides were steamed broccoli and sweet potato mashed with butter.