Place all ingredients in the slow cooker, except the cornstarch and water.
Cook on high for 4 hours (or medium for 6, or low for 8).
In a small sauce pan, whisk the cornstarch and water.
Heat sauce pan over medium heat while occasionally whisking.
Add 2/3 cup of the liquid from the slow cooker to the pan and whisk together until it thickens up.
Place thickened liquid into the slow cooker and stir in well.
Serve over white rice.