ActuallyAdditions/src/generated/resources/data/actuallyadditions/recipes/coal_generator.json

{
  "type": "minecraft:crafting_shaped",
  "category": "misc",
  "key": {
    "A": {
      "item": "minecraft:coal"
    },
    "C": {
      "tag": "forge:cobblestone"
    },
    "I": {
      "item": "actuallyadditions:iron_casing"
    }
  },
  "pattern": [
    "CIC",
    "CAC",
    "CIC"
  ],
  "result": {
    "item": "actuallyadditions:coal_generator"
  }
}