Red Wine Mushroom Burger with a Horseradish Cream Sauce - Sutter Home Family Vineyards

Ingredients

• 2 lbs. freshly ground chuck
• 1 tsp. kosher salt
• 1/4 cup finely grated parmesan cheese
• 1/2 tsp. freshly ground pepper
• 1/4 tsp. red pepper flakes
• 4 Tbsp. Colavita olive oil
• 1 3/4 oz. package of dried mixed mushrooms
• 2 long stems of fresh rosemary, leaves removed and roughly chopped
• 1/2 tsp. salt
• 6 green onions, chopped
• 3 Tbsp. Colavita olive oil
• 3 Tbsp. flour
• 3 garlic cloves, minced
• 1/2 cup sour cream
• 2 Tbsp. prepared horseradish
• 1/4 tsp. kosher salt
• 3 Tbsp. vegetable oil for brushing on the grill rack
• 6 Ciabatta rolls, split
• 6 pieces Bibb lettuce, rinsed and dried