סימן פ סעיף כב
דָּבָר שֶׁהַמֶּלַח פּוֹעֵל בּוֹ לְרַכְּכוֹ אוֹ לְהָפִיג חֲרִיפוּתוֹ, אָסוּר לְמָלְחוֹ מִשּׁוּם דַּהֲוֵי כְּמוֹ מְעַבֵּד. וְלָכֵן אָסוּר לִמְלוֹחַ (גורקען) חַיִּין, וְכֵן צְנוֹן אוֹ בְּצָלִים אָסוּר לִמְלוֹחַ, אֲפִלּוּ מַה שֶּׁצָּרִיךְ לְאוֹתָהּ סְעוּדָּה, אֶלָּא מַטְבִּיל בְּמֶלַח חֲתִיכָה חֲתִיכָה וְאוֹכֵל. אֲבָל בֵּיצִים וּבָשָׂר מְבֻשָּׁל וְכַיּוֹצֵא בָּהֶם שֶׁאֵין הַמֶּלַח מוֹעִיל לָהֶן אֶלָּא שֶׁיִּתֵּן בָּהֶם טַעַם מֶלַח, מֻתָּר לְמָלְחָם לְאָכְלָם בְּאוֹתָהּ סְעוּדָּה. אֲבָל בִּשְׁבִיל לְהַנִּיחָם לִסְעוּדָּה אַחֶרֶת, אָסוּר.
It is forbidden to salt anything which will become soft or less pungent94This rule encompasses any change in its nature, such as hardening, etc. (Shulchan Aruch Harav 321: 4) because of the salt. This is similar to (the melachah of) me'abeid95Tanning hides is an av melachah. Salting food, as described here, is a shevus (Rabbinical) [Tosafos Maseches Shabbos 75b]. [tanning]. Therefore, it is forbidden to salt raw cucumbers. It is also forbidden to salt radishes or onions, even if they are needed for that meal, but you may dip each piece in salt and eat them.96Salting more than one at a time or letting them remain in salt are situations associated with מְעַבֵּד (tanning) and are prohibited. Eggs, cooked meat,97It is forbidden to salt raw meat, even if it will spoil by not salting it. (Magein Avraham-Rishonim, Mishnah Berurah) and other foods that are not affected by salt, except that it gives them a salty flavor, may be salted to be eaten at that meal. It is forbidden98The author rules like the Shibolei Haleket—Gaonim, Taz and Magein Avraham. However, Raavan, Eliyahu Rabbah and Vilna Gaon permit salting the foods for another meal to be eaten on that day. They hold that it is forbidden only when it is done for a meal to be eaten after Shabbos. Mishnah Berurah relies on this opinion in case of hot weather, when it will spoil if not salted, for then even the Taz permits it to be salted for another meal on that Shabbos. to salt them for another meal.
תנא דבי אליהו כל השונה הלכות בכל יום מובטח לו שהוא בן העולם הבא שנאמר הליכות עולם לו אל תקרי הליכות אלא הלכות (נדה ע"ג.)