Trim and cube sirloin into 1-inch pieces, pat completely dry

Optional: marinate in soy sauce, Worcestershire, oil, garlic powder, pepper for 2-4 hours

Heat vegetable oil in large skillet over high heat until shimmering

Sear beef in batches 2-3 minutes per side until browned, don't overcrowd

Remove beef to plate, don't clean pan

Reduce heat to medium, add 1 tbsp butter, onion, and mushrooms

Cook 5-6 minutes until softened, add garlic, cook 1 minute

Push vegetables aside, add 3 tbsp butter to center, let melt

Sprinkle 3 tbsp flour over butter, whisk constantly 1-2 minutes until golden

Slowly add beef broth while whisking to prevent lumps

Add Worcestershire, soy sauce, tomato paste, and all seasonings

Bring to simmer, cook 3-4 minutes until thickened

Return beef and juices to pan, stir to coat

Reduce heat to low, cover, simmer gently 15-20 minutes until tender

Stir in remaining 2 tbsp butter for richness

Garnish with parsley, serve over mashed potatoes, rice, or noodles