1. Remove congealed surface fat from cooking liquid and discard.
2. If you don't have cooking liquid from Baton Twirling's Slow Cooker Cottage Roll recipe, leave it out and substitute any kind of stock or water.
3. While chopping vegetables, heat liquid in saucepan or microwave a few minutes until warm.
4. Pour liquid into slow cooker along with peas, carrots, celery, onion, thyme and pepper.
5. Add cooking liquid or any kind of stock or water to within 2 inches of top of slow cooker.
6. Stir, cover and cook on low setting 10 to 12 hours or until peas and vegetables are soft.
7. In food processor or blender, purée soup in batches until smooth.
8. If necessary, return to slow cooker to heat to serving temperature (or on stove in saucepan or in microwave).
9. Add diced cottage roll, if using, to soup before heating.
10. Season to taste with salt and pepper.