Should separating pull apart Challah rolls be considered a forbidden act of completion?

Question

I have heard many people state that using Challah* rolls that are baked in one unit to be pulled apart might be a problem for making Leḥem** Mishneh on Shabbath. In fact, there are rolls that are sold in my local supermarket that have a sticker on the outside of the bag that says something to the effect of, "Ask your rabbi about Lechem*** Mishneh."

I've heard some people state that, in fact, it is not a problem from that perspective, since the rolls are meant to be used separately.

My question is, if the latter opinion is correct, wouldn't that make it an even bigger problem, namely completing the creation of some product, or does this not apply to food?

Answer 1

The question of Makah B'Patish comes into play regarding opening bottles, cans and packages on Shabbos. Even by these items there is a dispute amongst the Poskim whether this is allowed as it may already be a Kli prior to opening them or not allowed. Even among those that do not allow opening these on Shabbos there are those that hold if you immediately use the contents and dispose of the container then you are not using it as a Kli and you may. I have not seen any Poskim having concerns regarding breaking apart Challa rolls which leads me to believe that there is no issue of Makah B'Patish over here.