How to Season a Molcajete (Volcanic Rock Mortar & Pestle)

If you’ve ever bought a real volcanic‑rock molcajete, you know the truth: it’s beautiful, it’s traditional, and it’s full of gritty stone dust. Before you make your first salsa, guacamole, or spice blend, you need to season it. Think of it as a deep clean that gets rid of loose grit and preps the molcajete to add flavor, not rocks, to whatever you’re making.

The good news is that curing a molcajete is very simple and generally only needs to be done once. It just takes a little elbow grease and a few pantry staples. My molcajete was already seasoned, but for the sake of this article, I gave it a refresher.

What You’ll Need

Uncooked white rice
Warm water
Coarse or flaky salt
Garlic cloves (optional but traditional)

How to Season Your Molcajete (Step‑by‑Step)

Rinse the molcajete. Give it a good rinse under warm water to remove the obvious dust. Don't use any soap. The stone is porous and will hold onto it.

Rinsed and dried volcanic rock molcajete sitting on a kitchen counter. — Rinsed and dried volcanic rock molcajete.

Grind dry rice. Add a handful of uncooked rice to the bowl and start grinding with the tejolote (the pestle). The rice will turn gray as it picks up loose stone particles. Don't forget the rim and to rotate the pestal every so often to get a good polish on it as well. Dump it out and repeat until the rice stays mostly white. This can take several rounds. Once the ground rice stays white, remove as much as you can by dumping it out and using a paper towel to gently dust it.

Some uncooked white rice sits in the molcajete with the tejolote, or pestal, resting on it. — Grind the dry rice.

The rice has been ground into a white powder. The whole molcajete, including the edges and the tejolote, are covered in the white powder.t — Grind the rice until it's white.

Make a salt‑garlic paste. Add a spoonful of coarse salt and a couple of garlic cloves. Grind them into a paste, pushing it into all the crevices, including the tejolote/pestal. This helps smooth the surface and seasons the stone. Let it sit for at least 45 minutes. The stone will absorb a fair amount, if not all of the moisture.

A close-up of the molcajete. Some salt and a few cloves of garlic rest inside. Tiny bits of white rice powder are compacted into the porous surface of the molcajete. — As you can see in this close-up, the rice has cleaned and filled a lot of the holes in the stone.

The whole molcajete and tejolote are covered in the ground salt and garlic mixture and left to sit.

Rinse again. Rinse out the paste with warm water. You’ll notice the surface feels much smoother.

Let it dry completely. Air‑dry the molcajete fully before storing or using it. A seasoned molcajete should feel slightly smoother and leave no dust on your fingers.

How to Know It’s Ready

A properly seasoned molcajete will:

Stop shedding grit
Feel smoother inside
Keep rice mostly white when ground

Once it’s dried, you’re good to go. The more you use it, the better it gets. Every batch of salsa, guacamole, or spice paste continues to season the stone and deepen its character. Remember to never use soap on your molcajete!

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