Why Your Cacao Is Gritty: A Question of Microns
Almost every texture complaint about drinking cacao — gritty, thin, claggy, separating — comes down to one variable that nobody measures: how big the particles are. Here are the questions people actually ask, answered from that single mechanism.
Why does my cacao taste gritty?
Because some of the particles are above the threshold at which your palate can detect them individually.
That threshold sits somewhere around 25 to 30 microns for most people. Below it, particles read as smooth; above it, the tongue starts registering them as discrete objects and the sensation is grit.
Industrial couverture chocolate is refined to roughly 15 to 20 microns precisely to sit under that line — days of conching exist to achieve it. Stone-ground ceremonial cacao is typically much coarser, often in the 40 to 100 micron range, and traditional Mexican drinking chocolate is coarser still.
So a degree of texture is not a defect. It is the signature of stone grinding, and it is the same reason a Oaxacan chocolate atole feels the way it does. What you are tasting is the absence of industrial refining, which is also what preserves the flavour compounds that long conching drives off.
If it is genuinely unpleasant rather than merely present, the fix is not finer cacao — it is hotter liquid and better dispersion, covered below.
Isn't finer always better?
No, and this is the part that surprises people.
Finer particles do disperse faster and feel smoother, but they also increase viscosity substantially at the same solids content. Surface area scales inversely with diameter — halve the particle size and you roughly double the surface area per unit mass — and it is the total surface interacting with the liquid that governs how thick the mixture behaves.
Push too fine and the drink becomes claggy and heavy rather than silky, and it will coat the mouth in a way that reads as cloying.
There is a further wrinkle from industrial chocolate practice that is genuinely counterintuitive: a mixture of particle sizes flows better than uniform particles at the same solids. Smaller particles fill the gaps between larger ones, which lets the whole system move more freely. Perfectly uniform grinding is not the goal, and stone grinding produces a natural spread of sizes that works in its favour.
Does grind size matter if cacao is suspended rather than brewed?
It matters more, not less.
When you brew coffee or tea, particle size governs extraction rate and the grounds are discarded — the particles never reach your mouth. With cacao nothing is discarded. Every particle you put in the cup is a particle you drink.
So grind size is not affecting how much you extract. It is directly determining mouthfeel, dispersion speed, how long the suspension stays stable before settling, and how quickly the cocoa butter melts out.
That last point is the practical one. Cocoa butter melts between roughly 34 and 38°C, and it has to melt for the particles to release and disperse. Larger particles have less surface exposed to the hot liquid, so they take longer to reach melting throughout. This is why coarse cacao in insufficiently hot liquid stays stubbornly gritty — the fat at the centre of each particle never liquefies.
Why does the same cacao seem thicker some days?
Three variables, in order of how often they are the culprit.
Temperature. Below about 70°C the cocoa butter is not fully liquid and the mixture behaves as a coarser suspension. It reads as thin and gritty at once, which feels contradictory but is exactly what incomplete melting produces.
Settling. A bag of ground cacao stratifies as it sits and is transported — finer particles migrate downward through the coarser ones. The top of an undisturbed bag is coarser than the bottom. Shake the bag before measuring and this disappears.
Agitation. Whisking does not change particle size but it does break up agglomerates — clusters of particles stuck together by fat, which behave as single much larger particles until sheared apart. A poorly whisked cup contains effectively coarser material than a well whisked one made from identical cacao.
How do I get the size I want from paste?
Paste gives you control that ground cacao does not, because you generate the particles yourself.
A microplane produces very fine shavings with a large surface area that melt almost on contact — the fastest and smoothest option. A coarse grater gives medium shreds, a good general choice. Chopping with a knife produces irregular chunks that take two or three minutes to melt fully and need stirring.
Work with cold paste. At room temperature it smears and clogs; straight from the fridge it is brittle and shaves cleanly.
The useful trick is deliberately mixing sizes — most of the dose microplaned for speed and smoothness, a small portion coarsely grated. You get fast dispersion with a little textural interest, which is the domestic version of the bimodal principle above.
What size should the toasted coconut be?
The same logic, applied to a topping, and the three grades behave completely differently.
Desiccated is finely shredded and near-dust. In a hot drink it hydrates within about thirty seconds, loses all texture, and disappears into the body of the cup. Useful for coconut flavour throughout; useless as a topping.
Flaked is broad thin ribbons. It holds crispness for a couple of minutes floating on the surface, then softens. This is the topping grade.
Chips are thicker, sometimes several millimetres. They stay crisp for the length of the drink because their thickness means the interior never fully hydrates. Best if you want texture at the last sip.
Toast whichever you use: a dry pan over medium heat, shaken constantly, two to four minutes depending on grade until the edges turn gold. Desiccated burns in under two minutes and goes from pale to acrid with almost no warning. Tip it out of the pan immediately — residual heat will take it past done.
Does it matter how I zest the lime?
Yes, and it is the same variable a third time.
Most citrus aroma lives in oil glands in the coloured outer layer of the peel. A microplane ruptures a very large number of those glands and releases the oil immediately — maximum aroma, delivered at once, and it fades within a few minutes.
A vegetable peeler takes broad strips with most glands intact. The oil releases slowly over several minutes, so the aroma is less intense initially and lasts considerably longer.
For a drink you will finish in ten minutes, use both: microplaned zest stirred in for immediate lift, and a peeler strip expressed over the surface and dropped in for the tail.
The recipe
For one 300 ml cup:
- Toast 8 g of flaked coconut in a dry pan, two to three minutes, until gold at the edges. Tip out immediately and let it crisp as it cools.
- Heat 240 ml of coconut milk or water to 78–80°C — hotter than usual, because you want the cocoa butter comfortably above its melting range.
- Microplane 14 g of cacao paste, or weigh 14 g of ground cacao and shake the bag first.
- Whisk the cacao into two tablespoons of the hot liquid to a smooth glossy paste with no visible agglomerates. This step is where grittiness is won or lost.
- Add the remaining liquid gradually, whisking. A full minute of vigorous whisking, not thirty seconds.
- Add a pinch of salt and the microplaned zest of half a lime.
- Float the toasted coconut on top, express a peeler strip of lime over the surface, and drink within a few minutes while the flakes are still crisp.
Fourteen grams sits in the 10 to 15 g everyday range. Note the deliberately higher liquid temperature — with a coarse stone-ground cacao it is the single most effective change against grit, and it costs nothing.
For the format that gives you the most control over particle size, the ceremonial cacao paste lets you grate to whatever grade you want. If you would rather not grate anything, the pure ground cacao is already milled and simply needs the bag shaken and the liquid hot enough.
