Your coins are in the pot, the water is warming, and the only milk in the fridge is the one that goes in your tea. It is a fair question, and it comes up most often from someone about to make their first cup who does not want to get it wrong.
The short answer is that we would steer you away from it. Not because there is a rule to obey, but because cow’s milk works against three separate things at once: the way cacao has been prepared for thousands of years, the way she is held in ceremony, and what actually reaches you once she is in the cup.
The drink existed long before milk did
Cacao’s lineage runs through Mesoamerica, through the Maya and the Mexica, where she was prepared with water. Cacao was ground by hand on a stone metate, with hot water, and whatever the region offered alongside her: maize, chilli, vanilla, achiote, flowers.
And it was drunk frothy. The person preparing it poured the liquid from one vessel into another, held high, over and over, until the cacao butter lifted and the surface built into a thick head of foam. The whole cup was drunk, foam and all, but the foam was the part that mattered. Bernardino de Sahagún, writing in the sixteenth century, described Aztec chocolate sellers raising the head, skimming it off, and raising it again. A cup that arrived flat was considered unfinished.
There was no dairy in any of it, because there was no dairy to be had. Cattle arrived in the Americas with Europeans, and so did the habit of putting milk into chocolate. Milk chocolate is a few hundred years old. Cacao prepared in water is several thousand.
So when cacao ceremony is held or a cup is being made with water as the base, that is not a stylistic preference someone landed on. It is simply the older form of the drink, still being made the way it has always been made.
Our own cacao grows in Peru, where we work with the Asháninka people. Theirs is an Amazonian relationship with the forest and its plants rather than a Mesoamerican one, a different living tradition entirely, but the underlying principle sits in the same place. The plant is worked with as she is, not covered over by another substance or ingredient.
What cacao ceremony teaches
In ceremonial settings cacao is treated as a plant with her own character, not as an ingredient in a recipe. The instruction facilitators give tends to be some version of the same thing: keep her clear, use water or something close to it. If spices then use those that have long been worked alongside her, like chilli or cinnamon or vanilla, nothing heavy enough to dominate and take over.
You will have noticed we call cacao her, that’s not a stylistic tic, in the lineages that carry this practice she is Mama Cacao, understood as a feminine presence with her own temperament rather than a substance with a nutritional profile. You do not have to hold that view yourself to connect with her and enjoy drinking you cacao daily, however it's worth bringing up here to explain why, from this angle, diary milk is advised against.
Many cacao ceremony facilitators frame the argument against cow’s milk in terms of energetics, or frequency. The reasoning being that dairy is a dense, animal-derived food and cacao is a plant asking to be met directly. We are not going to tell that this is how you should view cacao in order to drink her, what we will say is that the practical instruction has stayed remarkably consistent across teachers, lineages and continents, and it consistently points the same way - not to mix it with dairy.
What the milk does in the cup
There is also a physical reason, and it is the one that tends to surprise people.
A good part of why raw ceremonial cacao feels different from a bar of chocolate is the nourishment: the flavanols and polyphenols that heat, alkalisation and refining strip out of most commercial cocoa but are very much present in ceremonial cacao. Milk protein appears to get in the way of them too. A study published in Nature in 2003 found that eating plain dark chocolate raised both the total antioxidant capacity and the epicatechin content of blood plasma, and that these effects were markedly reduced when the chocolate was eaten with milk or as milk chocolate. The working explanation is that casein, the main protein in dairy, binds to the polyphenols and makes them harder for the body to take up.
It is worth saying that this is not settled. Later work has failed to reproduce the effect, with several studies finding that milk did not affect the bioavailability of cocoa polyphenols. The debate has been running for twenty years and it is not over.
There's another reason though - milk is high in calcium, and calcium competes with other minerals for absorption in the gut. The effect on iron has been shown consistently in single-meal studies, with both haem and non-haem iron absorption inhibited by calcium supplements and by dairy products. Cacao is a good source of iron and zinc, so dairy is at least an odd thing to reach for if minerals are part of why you are drinking her.
And then there is the taste
Cacao is roughly half cacao butter by weight. That fat is where the body comes from, which is why a cup made with water alone still coats the mouth rather than tasting thin or watery.
Cow’s milk lays a second fat and a lactic sweetness over the top, and the effect is a flattening. The fruit notes go quiet, what is left tastes like hot chocolate, which is a lovely thing to drink, but it is not the drink you set out to make.
What to use instead
Start with water. It is the traditional base, it lets her taste like herself, and it is what we would suggest for a first cup so you know her taste and can then experiment with any spices or plant milk according to your preferences.
If you want something creamier, whisk your cup hard for twenty seconds, or use a milk frother, and the cacao butter lifts into a head of foam and a rounder mouthfeel from nothing but cacao and water.
From there, if you want more body:
• Oat is the creamiest and the easiest place to start if water alone feels not enough.
• Almond is lighter and lets more of the cacao taste through.
• Coconut is rich, and brings a flavour of its own that either suits you or does not – personally we tend to avoid it as it overpowers the taste, but you're more than welcome to try it.
A splash of plant based milk goes further than you think. Try a third plant milk to two thirds water before going any heavier.
Whichever you choose, check it is unsweetened. Sweetened oat and almond milks carry more sugar than most people expect.
One thing that matters more than the liquid you choose: keep the temperature below 70 to 80 degrees. It has to be warm, not boiling as above that you begin losing the compounds you are drinking her for.
If you have already made a cup with milk
Nothing is ruined. You made a nice drink and now you know something :)
Either way enjoy your cup!
If you are still choosing where to begin, the 250g is where most people start.
