Kashering a granite surface
If a person is beginning to keep Kashrut and wishes to make his kitchen kosher, can he kasher the granite kitchen counters? If so, in what manner?

Answer: All kinds of granite countertops may be kashered. This is done in the following manner: Boiling water is poured over the whole surface while a white-hot stone is being touched to the surface. Experience shows that this action does not damage the counter. Someone who is nevertheless concerned about possible damage being caused by a white hot stone being passed over the counter may kasher the counter by having a millimeter of the entire counter surface scraped off.