Swiss burgers with a mushroom and rosemary sauce recipe

Ingredients

• 1 pound ground beef
• 2 tsp fresh minced rosemary
• 2 tbsp minced shallot
• Salt and black pepper
• 1 tbsp Worcestershire sauce
• 1 tbsp olive oil
• 4 slices Swiss cheese

• 2 tbsp butter
• 8 ounces mushrooms (sliced)
• 1 tbsp minced shallot
• 1 garlic clove (peeled, minced)
• 1 tsp fresh minced rosemary
• 1 cup beef stock
• 4 brioche burger buns (toasted)

1. Combine the beef, rosemary, shallot, salt, black pepper, and Worcestershire sauce in a large bowl. Shape into 4 even patties and set to one side.
2. Next, warm olive oil in a skillet over moderately high heat and sauté for 4 minutes each side. Place a cheese slice on top of each burger and wait until it begins to melt. Remove the burgers from the pan and keep warm.
3. Next, prepare the sauce. Melt 1 tbsp butter using the same skillet and sauté the mushrooms and 1 tbsp shallot for 5 minutes. Season to taste and add the garlic and rosemary sautéing for 60 seconds more.
4. Pour in the beef stock and bring to a simmer for 5 minutes before stirring in the remaining butter.
5. Arrange the burgers in the buns and top with the sauce. Serve straight away.