Type: manual_labour:mortar_grinding

This recipe takes a single ingredient. It does not need a tool slot because any Pestle will work just fine. You can also add an optional processing_time in ticks (the default is 100), and an optional fluid_results array — see Mortar Fluids for how the tanks work.

For Create users, this falls back to the Millstone or Crushing Wheels (though the crushing wheel fallback is disabled by default, for balance reasons). You can toggle these with use_create_milling_recipes and use_create_crushing_recipes.

{
  "type": "manual_labour:mortar_grinding",
  "ingredient": {
    "item": "minecraft:wheat"
  },
  "processing_time": 100,
  "results": [
    {
      "result": {
        "id": "minecraft:wheat_seeds",
        "count": 2
      },
      "chance": 1.0
    }
  ]
}

Grinding something down into a liquid works too. This one produces only fluid, so it leaves results out:

{
  "type": "manual_labour:mortar_grinding",
  "ingredient": {
    "item": "minecraft:sweet_berries"
  },
  "processing_time": 60,
  "fluid_results": [
    {
      "id": "minecraft:water",
      "amount": 100
    }
  ]
}