Step 1
Toss ¾ cup panko breadcrumbs, 1 Tbsp. plus 2 tsp. Worcestershire sauce, and 2 shallots, finely chopped, in a big bowl. Let sit 5 minutes to permit panko to hydrate.
Step 2
Add 1 giant egg, 1 lb. floor beef, 5 garlic cloves, finely grated, 2 tsp. mustard powder, 2 tsp. Diamond Crystal or 1¼ tsp. Morton kosher salt, and 1 tsp. freshly floor pepper to panko combination and blend along with your fingers to mix. Kind meat combination into 4 oval patties about ¾” thick; place on a parchment-lined baking sheet.
Step 3
Warmth 2 Tbsp. extra-virgin olive oil in a big skillet over medium. Working in batches if wanted, prepare dinner patties till deep golden brown, 5–7 minutes per aspect. Switch to a plate. Pour fats from skillet; discard.
Step 4
Soften 4 Tbsp. unsalted butter in similar skillet over medium-high warmth. Cook dinner 3 shallots, thinly sliced, stirring usually, till softened, about 3 minutes. Add 1 lb. crimini mushrooms, thinly sliced, and remaining ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt and prepare dinner, stirring usually, till mushrooms launch their liquid and brown barely (liquid ought to have evaporated), 8–10 minutes. Add remaining 4 garlic cloves, finely grated; prepare dinner, stirring, till aromatic, about 30 seconds.
Step 5
Sprinkle in 3 Tbsp. all-purpose flour and stir to coat shallots and mushrooms. Stirring always, step by step add 3 cups low-sodium hen broth, then juice of 1 lemon, 5 sprigs thyme, remaining 1 tsp. mustard powder, and ½ tsp. freshly floor pepper. Convey to a simmer and prepare dinner, adjusting warmth as wanted to take care of a delicate simmer, till sauce is decreased by about half, 10–12 minutes. Style and season with extra salt and pepper if wanted.
Step 6
Add Salisbury steak patties to sauce; simmer till heated and cooked via and sauce is thick sufficient to coat a spoon, about 5 minutes. Take away from warmth and high with ¼ cup coarsely chopped parsley to serve.
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