Rosh Yeshiva Responds
Rabbi Linzer answers halakhic questions from rabbis and community members

29 01, 2023

Sous Vide—Tevilat Keilim and Warming Food on Shabbat

January 29th, 2023|Bishul, Kashrut, Orach Chayim, Shabbat, Technology, Tevilat Keilim, Yoreh De'ah|

QUESTION
New York

Two questions regarding a sous vide:

1) Does it require tevilah?
2) Can it be used to reheat food on Shabbat, assuming it is on and in heated water from Erev Shabbat?

ANSWER

1. It does not require tevilah. It does not come in direct contact with the food (plastic bag and water both intervene). (Shulchan Arukh YD 120:4, Arukh HaShulchan YD 120:32, Sefer Tevilat Keilim, 1:4 ft. 7)

2.

15 01, 2023

Tevilat Keilim for a Mug with a Rubber Stopper

January 15th, 2023|Kashrut, Tevilat Keilim, Yoreh De'ah|

QUESTION

Maryland

This glass mug by Bodum has a rubber stopper at the bottom that is designed to allow the air trapped between the two layers to expand due to heat but to not let water in since the water would get trapped inside. Can it be toveled/is the rubber a hatzitza? It is designed to be there and be left in place, so would it be considered to be eino makpid? (YD 120:13)

ANSWER

If this is a functional part of the mug, then it is more than eino makpid—it