Does one need to toivel the glass to an earthenware chulent pot? The food steam hits the pot but the glass never really touches the food, and the pot itself doesnt need tevila.
The question does not specify the function of the glass.
If the pot has a glass lid, the lid required tevilah (Rema 120:5).
If the glass is performing some other function, which is unrelated to the food, it will not require tevilah.