Quite simple - you boil meat/fish/vegetables and water turns into broth that can be used in crafting more food like soups. Or you can just drink it for some boost.
Alternatively - a total cooking revamp where instead of "crafting" food items you "process" it - like chopping and sauteing vegetables and boiling meat to create some dish which depends on input components and gets a name based on what you actually created. A recipe book would describe steps like what should be combined to get a final dish but the intermediate products are created independently.
This would definitely add depth and complexity, turning Salem from Mortal Combat with corn into Mortal Combat with cooking.