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If they are fully cooked, you would only need to warm them. I would say on a medium heat about 3 or 4 minutes per side.

The best way to cook roasts of any type (beef, pork, turkey, chicken, etc.) is by using Reynolds Wrap Cooking Bags. They are fool-proof as long as you follow the directions. You must be sure to put in 3 TBS of flour and cut 6 small slices/punctures in the top of the bag but other than that, they are a snap. And, you can add any type of vegs along with the meat. They also make clean up easy as you just throw the bag away. And the little other benefit is that roasts cook much quicker in the bags than without. Good luck.

first leave them out of the frige for 20 minutes than fry them with verry little oil the oil must be smoking for 45 secons each side