{
  "format_version": "1.12",
  "minecraft:recipe_furnace": {
    "description": {
    "identifier": "minecraft:furnace_log"
    },
   
    "tags": ["furnace"],
    "input": {
      "tag": "minecraft:logs_that_burn"
    },
    "output": "minecraft:coal:1",
    "priority": -1
  }
  
}