Ultimate Guide to Thai Mortar and Pestle

Watch The Video Tutorial

If you prefer to watch rather than read, here's a video where I talk you through all the information in this post!

What can you use a mortar and pestle for?

Obviously you can use it for crushing anything, but let’s get more specific. Here are all the things I use it for ... 

Peeling and “chopping” garlic

Peeling and chopping garlic is kind of the bane of my existence because I use garlic all the time, but it is way less painful with a mortar and pestle.

To peel garlic: A quick smash of the cloves and the peel slips off effortlessly, and if the bottom is hard and woody, I use the edge of the mortar as a cutting board to slice it off.

To "chop" garlic: After peeling, I just pound the garlic to the extent that I need. For a “rough chop” I leave it chunky, and if I need it “minced” I keep going until I have kind of a paste. This whole process takes less than a minute!

And because this bruises the garlic rather than just cutting it, more cells are broken and more garlic flavour will be released into the dish! This is why pesto aficionados will agree that THIS is the best way to make pesto.

And FYI any thin pieces of chili skin left after pounding aren't gonna cause a problem because that’s not where the heat is. The goal is to break down the pith and flesh and disperse all the seeds.

Alternatively, if you’re making soups you can also lightly crush to break and bruise the chilies so they can gently infuse the heat; and then since it’s still in one big piece, you can easily remove or avoid it after. 

Making Sauces, Dressings, Marinades, and Curry Pastes

Next is a big category of making marinades, sauces, dressings, and curry pastes. Let’s just call them “sauces” for simplicity.

Many sauces, Thai or otherwise, require that you add aromatics like garlic, ginger, or shallots. To get the flavour out of these aromatics, they need to be finely minced or grated…OR better yet…pounded!

This is one of my favourite uses of the M&P because I can pound all of the herbs at once; so it’s faster than mincing or grating herbs one at a time, and again we bruise and mash all the cells to extract maximum flavour in a way that chopping won’t do.

THEN the mortar doubles as a mixing bowl so I can finish the whole sauce in here without using more dishes.

Grind spices fresh every time

We all know that when it comes to spices the best flavour comes from grinding whole spices fresh, because pre-ground spices lose their flavour quickly. But many of us use pre-ground spices anyway because it is just more convenient than having to pull out a spice grinder for just half a teaspoon of cumin.

But if you keep your mortar and pestle on the counter, the process takes just seconds. In fact, in the video above I showed you how I ground up 1 teaspoon of cumin in just 18 seconds!

Chopping Nuts

If you need roughly chopped nuts, you could chase them around a cutting board with a knife, which I hate doing; OR you can just give them a couple of pounds in a M&P and you’ve got it ready to go, all contained within a bowl.

Getting more aroma out of sesame seeds

People often put toasted sesame seeds on things, but usually the seeds don’t make any difference at all because they’re kept intact. When sesame seeds are intact, the aroma is trapped INSIDE. But giving them a 3 second grind in a mortar, just until they break but still look whole, will release the nutty aromat you should be getting!

How to Use a Mortar & Pestle - The Techniques

There are 2 main techniques when it comes to using a mortar and pestle: Pounding and grinding. 

Pounding is a simple up and down motion that we use for moist ingredients like fresh herbs. If there is enough volume, stuff will eventually ride up the sides, so you also want be sliding the pestle off the side back down towards the center. If you’re doing extensive pounding like a curry paste, it’s a good idea to use a spatula and give it a flip every once in a while to redistribute and make sure you don’t miss anything. 

Grinding is a circular motion where you don’t lift the pestle. This is good for dry ingredients such as spices and rice for making toasted rice powder. But before you grind, you wanna give it a couple of pounds first to break them into smaller pieces as too-big pieces of spices will just roll around under the pestle. Breaking them first creates the traction needed for the grinding to work. 

Usually when I grind dry things, it's combination of pounding and grinding, but don’t overthink it - most of the time it will be very intuitive what motion is best for the thing you’re working with.  

So when you’re looking to do small jobs - like a few cloves of garlic, a handful of nuts, or a few teaspoons of spices - the mortar and pestle does not have a minimum limit, even a big one can grind ONE peppercorn if you wanted to!

Sometimes, however, I prefer to use a coffee grinder for dry ingredients if it’s either a larger amount, or if it’s dried chilies, which are quite tough to break down manually.

First, let me say that as you use the M&P over the years, you’re grinding stone on stone year in year out, there is going to be wear and tear on it. Teeny tiny amounts of granite particles are going to come off over time. Case in point: if you look at old mortar and pestles, they are gonna be smoother than brand new ones.

But granite particles are not toxic, so it is not a problem you need to worry about. In the same way that when you cook food in cast iron cookware, some iron will come out into your food, and that’s totally fine. 

With that out of the way, I personally do not do anything to my new M&P aside from giving it a good scrub with dish soap and water.  A good quality, granite mortar and pestle should already be well-finished and smooth on the inside, with a very slight texture that's natural to granite. Grinding rice in it one time is probably not gonna do much to further "polish" the stone.

However, if it’s not a good quality set, the inside might feel a little too rough, THEN there might be good reason to smooth it out with an initial grind in some way. You can certainly try rice, but I’ve seen people just grind it empty with a bit of water until it feels smoother (probably more effective than adding rice which will add a cushion).

BUT if you keep finding visible amounts of rock dust coming off even after using it many times, THAT is the sign of a low-quality mortar and pestle that may not even be granite. The material is not strong enough to be made into a mortar and pestle, and you should definitely get a better one. (Yes, these awful products are out there.)

But in either case, you don’t need to “season” it like a cast iron pan or a carbon steel wok; in the sense that you do not need to coat it with anything. You just want the bare stone.

How do I care for and clean my mortar and pestle?

Just hand wash it with soap and water like regular dishes and air dry, that’s it. Nothing special needs to be done to it at all; it is a basic, low maintenance tool. But I would not put it in the dishwasher because the chemicals in dishwasher detergent can be quite harsh and it might wear out the stone faster, so handwash to be safe.

Choosing the right mortar and pestle for me

There are a few factors to consider when it comes to choosing the right set for you, but the most important thing is probably size. In theory, the bigger the better, because the bigger it is the more versatile it is and the more power it has due to the bigger pestle.

The obvious problem here is that big ones are heavy and a pain to move around; and speaking from experience, the more of a pain it is to move around the LESS likely you are to use it. So there’s a balance to strike here. 

So in the ideal world you’d be over the top like me and have one of every size, but if you’re gonna have just one, then here’s what I recommend: 

• 1 cup capacity is the smallest I would go, because any smaller than this and it’s not gonna be very useful. This is gonna be good for light duty things like garlic, chilies, and spices. But because it's light, you will use this all the time.

• 2-cup capacity is probably a good all-purpose size for most people. You can tackle tougher things like lemongrass, you have more room for a larger amount of food, but it is heavy enough that I start to think twice before picking it up.
• 3-cup capacity is great if you want maximum versatility, you often cook for a crowd so you need to volume, and/or you wanna hand pound pesto and curry pastes. A 3-cup capacity will do it all, and for most people, I don’t see a reason for going any bigger. (It IS heavy though.)

Bottom line is, consider what do you want to use it for AND what is the weight threshold that will not deter you from using it. The last thing we want is for this to become a beautiful doorstop.