Best Ever Split Pea Soup from Good Enough to Eat - Cooking by the Book

Ingredients

• 1 large onion, chopped
• 4 stalks celery, chopped
• 2 cloves garlic, minced
• 2 tablespoons butter
• 2 tablespoons vegetable oil
• 1 ham hock or leftover ham bone
• 1 pound dried split peas, washed and drained
• 7 cups beef stock
• 1 tablespoon brown sugar
• 2 teaspoons kosher salt
• 1 teaspoon ground black pepper
• 1 bay leaf
• 1 pound carrots, chunked
• 1 tablespoon chopped fresh thyme, or 1 teaspoon dried