Hamburger Steaks with Mushroom Gravy

Ingredients

• 1 cup chicken stock
• 1/2 tsp pepper
• 1 1/2 Tbls olive oil, divided
• 1 Tbls flour
• 2 tsp olive oil
• 1 pound lean ground beef
• 1/4 tsp black pepper
• 2 tsp Worcestershire sauce
• 8 oz mushrooms (crimini, or baby bella), sliced
• 1/2 tsp salt
• 2 tsp Worcestershire sauce1