minecraft-assets/data/minecraft/recipes/glistering_melon_slice.json

{
  "type": "minecraft:crafting_shaped",
  "pattern": [
    "###",
    "#X#",
    "###"
  ],
  "key": {
    "#": {
      "item": "minecraft:gold_nugget"
    },
    "X": {
      "item": "minecraft:melon_slice"
    }
  },
  "result": {
    "item": "minecraft:glistering_melon_slice"
  }
}