Q&A from the Bais HaVaad Halacha Hotline

Grate Adventure

July 16, 2026

Q Is there a practical way to kasher the public charcoal grills installed at campgrounds and parks?

A The Torah (Bemidbar 31:23) establishes a principle in the context of the utensils from the spoils of the war with Midyan: “Kol davar asher yavo va’eish ta’aviru va’eish vetaheir (Everything that comes into fire, you shall pass through fire and it will be purified).” The Mishnah (Avodah Zarah 5:12) derives from this pasuk that a spit and a grill used with treif meat require libun (purging in fire) to eliminate the absorbed nonkosher taste.

The Gemara (Avodah Zarah 76a) says libun requires that the metal be heated until its outer layer is removed. The Rishonim codify the Yerushalmi’s language that it must be heated until sparks fly. Because today’s metallurgy differs vastly from that of the Gemara’s time, these indicators do not apply to modern utensils. Contemporary poskim have therefore established temperature-based guidelines: R’ Moshe Feinstein rules that libun chamur is achieved when the kli reaches 700°F (cited in Hag’alas Keilim 13 n. 432). Libun kal, which suffices in certain other contexts, occurs at 500°F.

Libun does not require that the entire vessel be in the fire at once; it can be done one part at a time, e.g., with a blowtorch (O.C. 451:11).

When a utensil is kashered via hag’alah (purging in boiling water), it must first be scrubbed clean of any residue. This is unnecessary in libun, as the fire destroys the residue (Taz O.C. 457:7).

In a typical charcoal grill, the grates reach about 500°F at most, well short of the libun chamur threshold. A reliable way to produce the necessary heat is with a blowtorch, but you might find that impractical at the park.

The recommended solution is to bring your own grates. You may place them atop the treif ones, provided that there is no food residue at any point of contact between the two sets of grates and that no new drippings from your cooking will be able to reach those contact points.

As an added precaution, it is advisable to place several layers of aluminum foil between your grates and the grill walls.