navy bean soup recipe

Ingredients 1 lb dried navy beans 2 tablespoons olive oil 1 large onion, chopped 2 cloves garlic, minced 2 carrots, peeled and chopped 2 celery stalks, chopped 1 ham hock or 2 cups diced ham 8 cups chicken broth (or water) 1 bay leaf 1 teaspoon dried thyme