Place all ingredients in the slow cooker except the water and cornstarch.
Cook on high for 4 hours.
In a small sauce pan, mix water and cornstarch together until well blended.
Add 1/2 cup of the liquid from the slow cooker and heat on medium, whisking often.
Once it bubbles and thickens, add it back to the slow cooker and mix.
Let it cook for another 15 minutes and serve over rice and top with sesame seeds.