Put meat, onion, celery, water, and soy sauce in slow cooker.
Cook on high for 4-5 hours or low for 7-8.
1 hour before cooking is done, add the bean sprouts and vegetables
Before serving, thicken the sauce with 3 tbsp water and 1-2 tsp of cornstarch, arrowroot powder, or brown rice flour. Allow the sauce to thicken for 5 minutes before serving.