Hi, I wanted to add a smelting recipe, where you would put a filled bottle in the ingredient slot and when the smelting is complete you would receive an item in the result slot and an empty bottle would remain in the ingredient slot, however I couldn't find any good resources elsewhere on how to add a recipe like this.

In which class is that method located?

What should you set the Ingredient parameter of SimpleCookingRecipeBuilder.cooking() to?

in you item class add code:

    @Override
    public ItemStack getContainerItem(ItemStack itemStack) {
        return itemStack.copy();
    }

    @Override
    public boolean hasContainerItem(ItemStack stack) {
        return true;
    }