Hot Hamburger Sandwich - Cooking like a Boss

Traditional Canadian comfort food. It's a burger on top of a slice of bread covered in gravy. Much nicer than it deserves to be! Serve with garden peas and chips.

4 medium onions	dice	fry in burger pan until golden	fry until mushrooms golden	melt	stir in	stir in	season	return burgers to pan	cover and simmer until cooked through	top
oil
8cups 1.89l 1893ml 3.33pint 126tbsp 379tsp mushrooms	slice
4tbsp 0.06l 60ml 12tsp 0.254cup 0.106pint butter
4tbsp 0.06l 60ml 12tsp 0.254cup 0.106pint flour
750ml ³⁄₄l 50tbsp 150tsp 3.17cup 1.32pint beef broth
2tbsp 0.03l 30ml 6tsp 0.127cup 0.053pint marmite
burgers
1000g 1kg 2.2lb 35.3oz minced beef	mix	form into 8 patties	brown	remove to plate
2tbsp 0.03l 30ml 6tsp 0.127cup 0.053pint worcestershire sauce
2tbsp 0.03l 30ml 6tsp 0.127cup 0.053pint garlic powder
salt
pepper
2tbsp 0.03l 30ml 6tsp 0.127cup 0.053pint onion powder
2 egg
oil
8 slices of white bread