bedrock-samples/behavior_pack/recipes/grindstone_from_mangrove_planks3.json

{
    "format_version": "1.16",
    "minecraft:recipe_shaped": {
        "description": {
            "identifier": "minecraft:grindstone_from_mangrove_planks3"
        },
        "tags": [
            "deprecated"
        ],
        "pattern": [
            "#"
        ],
        "key": {
            "#": {
                "item": "grindstone"
            }
        },
        "result": {
            "item": "grindstone"
        }
    }
}