[
  {
    "fluidInBarrel": "lava",
    "fluidOnTop": "water",
    "result": {
      "name": "minecraft:obsidian",
      "meta": 0
    }
  },
  {
    "fluidInBarrel": "water",
    "fluidOnTop": "lava",
    "result": {
      "name": "minecraft:cobblestone",
      "meta": 0
    }
  }
]