2tablespoonsbutter, plus some softened butter for toast
1small onion, chopped
1clovegarlic, finely chopped (I omitted this for hubby)
4slices1-inch thick good quality white bread
1/2cupstout beer, such as Guinness (I used Guinness…yum, I think there is still a can in the fridge…)
2 to 3dashes hot sauce, such as Tabasco (I went light on this)
1cupgrated extra-sharp yellow cheddar cheese
Heat a cast-iron skillet (I used a cast-iron grill pan, you could cook these any way you like to cook your burgers) over medium-high heat. Combine the beef, Worcestershire sauce, parsley, salt and pepper. Form 4 large patties, thinner at the center and thicker at the edges for even cooking.
Preheat the broiler and position a rack in the center of the oven. Melt two tablespoons butter in a medium saucepan over medium heat. Add the onion and the garlic (or no garlic in my case), season with salt and pepper and cook, stirring until very soft, 10 to 12 minutes.
Arrange the bread slices on a baking sheet. Lightly toast the bread on both sides under the broiler (I used the toaster oven and toasted both sides at once to eliminate a step). Lightly butter the toast with the softened butter.
Cook the burger patties in the hot skillet, turning once, for 8 minutes for medium rare, or 12 minutes for medium-well. When you flip your burgers over, continue making the sauce.
Sprinkle the flour into the pan with the onion and cook for a minute. Lower the heat to medium-low and stir in the beer, hot sauce and mustard. Stir in the cheese until melted. Add the eggs and stir constantly to thicken the sauce, 3 to 4 minutes.
On a baking sheet (I lined with foil for easy clean up), place the burgers on the toasts and spoon the sauce on top. Place under broiler to brown the sauce, 2 to 3 minutes.