Comforting Cottage Pie Pub Burger - Sutter Home Family Vineyards

Ingredients

• 1 whole head Garlic, left unpeeled (4 cloves for mashed potato, remainder for meat patties)
• 6 slices Yellow Onion
• 2 large Portobello Mushroom Caps
• 2 tablespoons Colavita Extra-Virgin Olive Oil, for brushing vegetables
• 1 pound Yukon Gold Potatoes, peeled and diced
• 2-1/2 teaspoons Salt (1 teaspoon for cooking potatoes, 1-1/2 teaspoons for meat patties)
• 3 tablespoons Butter (2 tablespoons for mashed potato, 1 tablespoon for greasing a sheet pan)
• 1-1/2 ounces extra-sharp Cheddar Cheese, grated
• 1 cup packaged frozen Mixed Vegetables (i.e. carrots, peas, corn and green beans)
• 5 tablespoons Worcestershire Sauce (4 tablespoons for meat patties, 1 tablespoon for gravy)
• 1 large glass Sutter Home Merlot (2 tablespoons for meat patties, 4 tablespoons for gravy, remainder for the cook)
• 2 tablespoons Chili Powder
• 1/2 cup fresh chopped Flat-Leaf Parsley, with 1 tablespoon reserved for assembly
• 2 pounds Ground Chuck
• 6 Potato Bread Rolls, split
• 1 10.5 oz. can prepared Beef Gravy
• Vegetable Oil, for brushing the grill rack