Baking and Boiling the Manna and the Roots of Eruv Tavshilin

"That which you will bake, bake, and that which you will boil, boil" (Exodus 16:23). On what is baked, bake; on what is boiled, boil. From here is derived the practice of eruv tavshilin [the dish set aside before a festival to permit cooking for the Sabbath], according to the words of the House of Shammai, who hold that one requires a separate setting-aside for each and every kind of food. Rabbi Yehoshua says: "That which you will bake, bake, and that which you will boil, boil." One who wishes to bake, let it be baked for him; and one who wishes to boil, let it be boiled for him. Rabbi Eleazar of Modi'in says: "That which you will bake, bake, and that which you will boil, boil." One who wishes to taste a baked thing tastes in it the taste of all baked foods in the world; and a boiled thing, he tastes in it the taste of all boiled foods in the world.