Gorgonzola Garlic Burgers with Tomato Pesto and Drunk Onions - Sutter Home Family Vineyards

Ingredients

• 2/3 cup mayonnaise
• 1/3 cup chopped shitake mushrooms
• 1/3 cup sun-dried tomatoes packed in olive oil
• 4 cloves of garlic
• 1/4 cup red wine (Cabernet Sauvignon works well)
• 1/4 cup balsamic vinegar
• 1/4 cup brown sugar
• 1 medium chopped red onion
• 2 lbs. ground beef
• 6 ounces gorgonzola cheese
• 1/2 cup chopped shitake mushrooms
• 5 cloves of chopped garlic
• Coarse salt
• 2 tablespoons red pepper flakes
• Vegetable oil, for brushing the grill rack
• 6 Onion Rolls
• Sliced avocado
• Spinach