Basically the recipe would scan my inventory and present me which items I would want to melt to produce my desired mitem.
You could have a kind of "alchemist's cookbook" in which your recipies are collected and then below the available and missing ingredients are listed in green/red & you just have to click on them to add them to an "anvil". However, it could also be that some people enjoy searching things together and manually "crafting" something.
