Step 1Toss ¾ cup panko breadcrumbs, 1 Tbsp. plus 2 tsp. Worcestershire sauce, and 2 shallots, finely chopped, in a large bowl. Let sit 5 minutes to allow panko to hydrate.Step 2Add 1 large egg, 1 lb. ground beef, 5 garlic cloves, finely grated, 2 tsp. mustard powder, 2 tsp. Diamond Crystal or 1¼ tsp.