Given the temperature outside today, I looked up the definition of cooking, OU Torah says “The Torah forbids cooking on Shabbat. “Cooking” means making food edible by heating it to above 120° F (49° C).
Cooking includes:
You may not make soft food hard (such as cooking an egg).
You may not make a hard food soft (such as cooking meat).
You may not, in any manner, heat (to 120° F or above ) liquids that you will drink or foods with liquids-such as sauces and gravies – whether fully cooked or not.