Beef Brisket with Savory Sauteed Apples

Ingredients

• 1 beef Brisket Flat Half (2-1/2 to 3-1/2 pounds)
• 1 tablespoon vegetable oil
• 1/2 teaspoon salt
• 1/2 teaspoon pepper
• 1 large onion, coarsely chopped, divided
• 1 teaspoon minced garlic
• 1 cup apple cider
• 2 tablespoons butter
• 5 cups sliced unpeeled apples, such as Fuji or Gala (about 1-1/2 pounds)
• 1 cup fresh or frozen cranberries
• 2 tablespoons packed light brown sugar
• 1/3 cup walnuts, toasted, coarsely chopped