5tablespoonsall purpose flourI used brown rice flour for a gluten free version
2yellow onionshalved and thinly sliced, about 2 cups worth
3cupscrimini or white button mushroomsabout 12 ounces worth, sliced or quartered if small
1/4lbprovolone cheesethinly sliced
Sourdough bread bowlscenters hollowed out, for serving
* I bought a top round roastsliced it into very thin steaks and then sliced that into thin strips.
Place the sliced meat in a large bowl and sprinkle with salt, pepper and onion powder, toss to distribute. Sprinkle 3 tablespoons of flour over the meat and toss well to coat all the pieces. Warm 3 tablespoons of oil in a large pot over medium high heat. (I used an enamel dutch oven, if you have a non-stick version like that, it will help the meat not stick to the pan, but it isn't required.) Add half the meat to the hot oil and spread it across the pan. Let it sear for a minute or two and then toss with tongs or flip to cook on the other sides. Remove to a plate (the meat should still be a little pink inside), repeat the steps with the remaining meat.
Add a tablespoon of oil to the pot, if needed, and add the onions along with a sprinkling more salt and pepper. Toss to coat the onions with oil and then allow them to cook, stirring occasionally, for about 6 minutes, until they have softened and turned golden brown. Add the mushrooms, the dried thyme and the garlic and continue sautéing for another 5-6 minutes, stirring occasionally.
Sprinkle the remaining 2 tablespoons of flour over the onion mixture and stir well to coat everything. Slowly add the HOT beef stock, stirring constantly, to avoid little lumps of flour from forming. Reduce the heat to medium low and simmer for about ten minutes to thicken the broth.
Remove from the heat and add the cooked sirloin, along with any juices from the plate. Stir to combine, taste and adjust seasonings as needed. Just before serving, preheat the oven to broil. Ladle the soup into prepared bread bowls, top with thinly sliced provolone and place the bowls on a large foil lined baking sheet. Broil for about 90 seconds, just until the cheese has melted and lightly browned. (it may take a few moments, longer, but not much more. Mine was perfect at 90 seconds.) Enjoy!