651. Subordinate Labors of Cooking

Shabbos 9:5

If a person puts meat on the coals and a portion the volume of a dried fig gets roasted, he is liable even if the roasted portions are not contiguous. If a portion the volume of a dried fig did not get cooked but the whole piece of meat gets half-cooked, he is liable. If the meat is only half-cooked on one side, he would not be liable until he turns the meat so that it gets half-cooked on both sides. If a person forgot that he had a loaf of bread in the oven when Shabbos started and he remembered, he may remove it before it bakes and makes him liable.

Shabbos 9:6

One who melts even the smallest amount of metal, or who heats it until it glows, performs a subordinate labor of cooking. Similarly, if one melts wax, tallow, tar, pitch or similar substances, he performs a subordinate labor of cooking, for which he is liable. If someone heats an earthenware utensil until the clay hardens, he is liable for cooking. The general rule is one is liable for cooking whether he uses heat to soften something firm (as with tar) or to harden something soft.