What is the meaning of "khwān"? Is it permissible to eat on it?

Question:
What is established that the Prophet (peace and blessings be upon him) did, in the category of customs, is considered a recommended practice (sunnah) or a custom. That is to say: "He never ate on a khwān"—is it a recommended practice (sunnah) for a person not to eat on a khwān?

Answer:
It is mentioned in some narrations that he ate on a khwān on some occasions.
These matters are closer to customs, such as clothing, food, and utensils, and the like, except for what is established as prohibited, such as gold and silver. Otherwise, the original ruling is that these are ordinary matters in which people vary and differ, and nothing is to be condemned in them.
Q: Is the khwān the sufrāh?
A: The khwān is a raised thing with legs, and the sufrāh is broader: it is the thing on legs, and the thing spread on the ground, such as felt mats, which are called a sufrāh, and the sufrāh on legs is also like that, such as the khwān.