1 tablespoon olive oil
1 chopped medium onion
4 carrots, thinly sliced
3 celery stalks, thinly sliced
1 tablespoon dried thyme leaves
Coarse salt and ground pepper
1 can (14.5 ounces) reduced-sodium chicken broth
1 bag (16 ounces) green split peas, picked over and rinsed
Ham bone plus 2 cups reserved ham from the recipe Glazed Ham with Apricot-Mustard Sauce, cut into 1/2-inch cubes
2 tablespoons butter
4 slices whole-wheat sandwich bread, crusts removed, cut into 1/4-inch cubes
1 to 2 tablespoons fresh lemon juice