#loader recipeevent crafttweaker
#debug

recipes.addShapeless(<minecraft:diamond> ,[<contenttweaker:zs_item>]);






decompile result: 
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//

import crafttweaker.CraftTweakerAPI;
import crafttweaker.api.item.IIngredient;
import crafttweaker.api.recipes.IRecipeAction;
import crafttweaker.api.recipes.IRecipeFunction;
import crafttweaker.mc1120.brackets.BracketHandlerItem;

public class Extra_recipe implements Runnable {
    public static void __script__() {
        CraftTweakerAPI.recipes.addShapeless(BracketHandlerItem.getItem("minecraft:diamond", 0), new IIngredient[]{BracketHandlerItem.getItem("contenttweaker:zs_item", 0)}, (IRecipeFunction)null, (IRecipeAction)null);
    }
}