Fir burger recipe - Le Coup de Grâce

Ingredients

• 6 tablespoons mayonnaise
• 1/2 teaspoon paprika
• 1/2 teaspoon sriracha (or more to taste)
• Salt and freshly ground pepper
• 1 large red onion, thinly sliced
• 1/4 cup olive oil
• 1 tablespoon blond beer
• 1 teaspoon cider vinegar
• 454 g white mushrooms, sliced
• 3 tablespoons butter
• 800 g semi-lean ground beef
• 2 1/2 tablespoons fir needles, finely chopped (or more to taste)
• 1/2 teaspoon Italian spices
• 2 tablespoons blond beer
• 8 slices of bacon, cooked crispy
• Roman heart salad
• 4 slices of Swiss cheese
• Ketchup and Dijon mustard
• Enormous hamburger buns