minecraft-assets/data/minecraft/recipe/redstone_from_smelting_redstone_ore.json

{
  "type": "minecraft:smelting",
  "category": "blocks",
  "cookingtime": 200,
  "experience": 0.7,
  "group": "redstone",
  "ingredient": "minecraft:redstone_ore",
  "result": {
    "id": "minecraft:redstone"
  }
}