src/main/resources/builtin/loot/entities/mushroom_cow.json

{
  "items": [
    {
      "default": {
        "count": {
          "max": 3,
          "min": 1
        },
        "item": "raw_beef"
      },
      "conditions": [
        {
          "item": "cooked_beef",
          "condition": "ENTITY_ONFIRE"
        }
      ]
    },
    {
      "default": {
        "count": {
          "max": 2
        },
        "item": "leather"
      }
    }
  ],
  "experience": {
    "count": {
      "max": 3,
      "min": 1
    }
  }
}