{
  "materials": [
    {
      "item": {
        "tag": "forge:ingots/iron"
      },
      "count": 6
    },
    {
      "item": {
        "tag": "forge:gunpowder"
      },
      "count": 12
    }
  ],
  "result": {
    "type": "ammo",
    "id": "tacz:rpg_rocket",
    "count": 3
  }
}