I believe לייג אַרייַן אַ גאָפּל אין דעם would be more correct.
It's still not correct. The verb לייג is to place or to put. Unless you are placing the fork inside the cavity of a turkey, it makes no sense to לייג אַרייַן אַ גאָפּל in anything edible. If I told you to put the fork away in the drawer, I might say לייג אַרייַן but not for poking a fork into a piece of food to test whether it's done.