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

{
  "type": "minecraft:crafting_shapeless",
  "ingredients": [
    {
      "item": "minecraft:spider_eye"
    },
    {
      "item": "minecraft:brown_mushroom"
    },
    {
      "item": "minecraft:sugar"
    }
  ],
  "result": {
    "item": "minecraft:fermented_spider_eye"
  }
}