It is permitted to melt foods on Yom Tov for the sake of eating the food on Yom Tov.

A. Is melting fat or ice on Yom Tov forbidden due to the Nolad prohibition which applies on Yom Tov?

Some Poskim^[1] rule that all forms of Nolad are forbidden on Yom Tov and therefore it is forbidden to melt fat or ice on Yom Tov as their own individual substance. However to melt them into another substance is permitted being that it is not recognizable as Nolad. Other Poskim^[2] rule that such a form of Nolad is permitted, and thus one may melt ice and fat on Yom Tov. According to Admur^[3] it is permitted to do melt ice and fat on Yom Tov, as the prohibition of Molid on Yom Tov was not made applicable to foods.^[4]

B. May one make ice cubes, freeze ice cream and the like on Yom Tov?

It is permitted to freeze water to make ice cubes and freeze ice cream on Yom Tov^[5], and so is the ruling according to Admur^[6]. However there are Poskim^[7] who are stringent.

C. May one make ice cream on Yom Tov?

Some Poskim^[8] rule that this is allowed^[9], although using an irregularity^[10]. Other Poskim^[11] rule that it is forbidden due to the Boneh prohibition which applies equally on Yom Tov.

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[1] Shut Mahrsham 6:33; Doveiv Meisharim 1:55; Shevet Hakihasi 3:170

[2] SSH”K 12 footnote 29 in name of Rav SZ”A.

[3] 511:7-KU”A 1

[4] So is implied from Admur ibid, and so understands Piskeiy Teshuvos 495 footnote 48

[5] So rules Chelkas Yaakov 2:98; Piskeiy Teshuvos 495:10.

As a) Nolad does not apply by food on Yom Tov. [Admur in previous question]; b) According to many Poskim making ice on Shabbos is not clearly a problem of Nolad and thus they allow it to be done in times of need, thus here by Yom Tov where it is even questionable whether Nolad applies to foods at all one may be lenient.

[6] As Admur rules [511:7] that Nolad does not apply to foods on Yom Tov.

[7] Doveiv Meisharim 1:55; Nitei Gavriel 17:8

[8] SSH”K 10:6

[9] As kneading is permitted to be done on Yom Tov.

[10] As anything which could have been done before Yom Tov without having its taste or quality diminished may only be done on Yom Tov with an irregularity. [Rama 495:1 Admur 495:5, and so rules M”A and M”B] Vetzaruch Iyun Gadol on SSH”K ibid which did not mention that an irregularity is needed. As well Tzaruch Iyun on Piskeiy Teshuvos which adds that an irregularity is needed if one had time to do it before Yom Tov, as it is ruled [Admur 495:6; M”B 495:10] that only in a case of “Ones” may one do it on Yom Tov without an irregularity. However if no “Ones” occurred, even if one forgot to do it before Yom Tov, it may only be done on Yom Tov with an irregularity.

[11] Piskeiy Teshuvos 495 footnote 52 based on the many Poskim which rule that making ice cream contains a Boneh prohibition which is equally forbidden on Yom Tov.