Divide beef into 6 patties, thinner if you want more well done patties
Season patties with salt, pepper and course ground seasoning evenly on both sides
Melt 2 tablespoons bitter in a saucepan over medium heat
Cook 3-4 patties on each side for 3-4 minutes, flipping so they do not burn and then removing to a platter and cover to keep warm
Melt another 2 tablespoons butter and repeat with remaining patties, remove to same platter
Melt remaining butter and add in sliced onions and salt
Cook, stirring often, until onions are softened and begin to brown, about 8 minutes
Stir in garlic and cook for an additional 1-2 minutes
Stir in Worcestershire sauce and beef stock and bring to a boil
In a small bowl whisk together cornstarch (start with 2 tablespoons) and water, stirring until well combined
Stir in cornstarch mixture and bring mixture back to a boil, stirring often
Add in hamburger patties and cook for an additional 8-10 minutes, or until patties are cooked to your desired doneness
Remove from heat and serve immediately with mashed potatoes, or roasted potatoes
Top with chopped parsley if desired
ENJOY
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