Slow Cooker Italian Pot Roast

Bahan-bahan (6 porsi)

• 3 pounds rump or chuck beef roast
• 4 medium garlic cloves, (peeled and cut in half)
• 1 tablespoon olive oil
• 1 large onion, (cut into wedges)
• One 28-ounce can crushed or whole San Marzano tomatoes
• 1 tablespoon chopped fresh rosemary
• 1 teaspoon kosher salt
• ½ teaspoon freshly ground black pepper