This is a great way to use up leftover chicken or turkey. One note, do not use the entire recipe of jerk seasoning. It is strong stuff, two tablespoons should be enough. Don't limit to just using this for for tamales. It can be used in won tons, crepes, or even ravioli.
Add the oil, onions, and garlic to a medium sauce pan and place over medium heat. Saute until the onions start to brown.
Add the chicken, stock, and seasoning. Turn down to low, cover, and simmer for about 10 minutes, stirring regularly to prevent burning. Allow to cool before using as filling.