Double Burgers with Mushrooms and Cheese Sauce

Ingredients

• Mushrooms

  • 1 lb (454 g) white button mushrooms, cut into thick slices
  • 3 tablespoons (45 ml) butter
  • 1/2 cup (125 ml) shallots, thinly sliced
  • 1 clove garlic, finely chopped
  • 1 sprig fresh thyme
  • 1/2 cup (125 ml) beef or chicken broth
  • 2 tablespoons (30 ml) Worcestershire sauce
  • 2 tablespoons (30 ml) sherry vinegar
  • Salt and pepper

• Cheese Sauce

  • 3 cups (750 ml) grated yellow sharp cheddar cheese (approximately 280 g / 10 oz)
  • 1 tablespoon (15 ml) cornstarch
  • 1 can 370 ml evaporated milk

• Hamburgers

  • 1 1/2 lb (675 g) lean ground beef
  • 4 kaiser rolls or hamburger buns
  • Arugula