split pea and ham soup recipe

Ingredients: 1 tablespoon olive oil 1 large onion, finely chopped 2 cloves garlic, minced 2 celery stalks, chopped 2 carrots, chopped 1 pound dried split peas, rinsed and sorted 1 meaty ham bone (or 2 cups diced cooked ham) 8 cups chicken broth (or water) 1 bay leaf 1 teaspoon dried thyme