In a large bowl combine the ground beef with minced onion and mustard. Season with salt and pepper and mix until combined. Divide the meat into 4 oval patties, 1/2 inch in thickness.
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In a skillet, heat the olive oil over medium-high heat and cook the patties for 5 minutes each side until browned. Remove from the skillet and transfer to a plate. Set aside.
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In the same skillet, melt the butter and cook the onions for 5 minutes until translucent. Add the flour and cook for 30 seconds while stirring. Gradually add the beef broth while whisking.
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Return the Hamburger patties to the skillet and spoon the gravy over the burgers. Cook for 5 more minutes then remove the skillet from the heat.
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