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

//

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