Simple Slow Cooker Pot Roast

Bahan-bahan (6 porsi)

• 2.5 pound bone-in chuck roast
• kosher salt (to taste)
• freshly ground black pepper (to taste)
• 2 tablespoons olive oil
• 1/2 medium onion (finely diced, about 1/2 cup)
• 2 small carrots (finely diced, about 1/2 cup)
• 2 cloves garlic (minced)
• 1 cup beef stock (plus additional water if needed)