Prepare the Truffle Aioli:

• In a small bowl, whisk together the mayonnaise, truffle oil, minced garlic, salt, and pepper until well combined. Set aside in the refrigerator.

Sauté the Wild Mushrooms:

• Heat a skillet over medium-high heat and add the butter and olive oil.
• Add the sliced wild mushrooms and sauté until they are tender and golden brown, about 5-7 minutes. Season with salt and pepper to taste. Set aside.

Shape and Season the Burger Patties:

• Divide the ground beef into four equal portions and shape them into burger patties.
• Season both sides of each patty with salt and freshly ground black pepper.

Grill or Cook the Burger Patties:

• Preheat your grill or a skillet/pan over medium-high heat. If using a skillet or pan, add a little cooking oil to prevent sticking.
• Cook the burger patties for about 4-5 minutes on each side for medium-rare, or longer if you prefer your burgers more well-done.
• During the last minute of cooking, add a slice of aged cheddar cheese on top of each patty and cover to allow it to melt.

Assemble the Gourmet Burger:

• Lightly toast the brioche or pretzel buns.
• Spread a generous amount of truffle aioli on both the top and bottom halves of the buns.
• Place a handful of mixed greens on the bottom bun.
• Add a perfectly cooked burger patty with melted cheese on top of the greens.
• Top with the sautéed wild mushrooms.

Serve and Enjoy:

• Place the top half of the bun on top of the toppings to complete your gourmet burger.

Optional:

• You can skewer your gourmet burger with a decorative toothpick or wrap it in parchment paper for an elegant presentation.