import crafttweaker.api.item.IItemStack;
import crafttweaker.api.item.IIngredient;

//

<tag:items:forge:dragonsteel_ingots>.add(<item:iceandfire:dragonsteel_ice_ingot>);
<tag:items:forge:dragonsteel_ingots>.add(<item:iceandfire:dragonsteel_fire_ingot>);
<tag:items:forge:dragonsteel_ingots>.add(<item:iceandfire:dragonsteel_lightning_ingot>);