Brewing Rooibos

Brewing rooibos is the act of steeping the dried, oxidised leaf of Aspalathus linearis, the red bush of the Cederberg, in hot water to make a deep amber-red infusion. The whole method fits in one line: one heaped teaspoon of rooibos to a cup, water at a full boil, a steep of five to ten minutes, and drink. There is no temperature to fear, no window to miss, and no penalty for forgetting it. This guide documents that method in full, the botanical reason rooibos never turns bitter the way black or green tea does, how long to steep for a given strength, how to take it with milk or over ice, the lighter hand green rooibos prefers, and the honest limits of "forgiving." The standing rule of tea, never over-steep, is a rule about tannins, and rooibos is a plant that carries almost none. You have simply been let off it.

The standard method

For a single cup, use one heaped teaspoon of loose rooibos, or one teabag, to roughly 200 to 240 ml of water (about a cup). Rooibos leaf is bulky and light, so a heaped spoon is the right measure rather than the level spoon a denser tea would want. Pour water straight off a full rolling boil, a hundred degrees Celsius (212°F), directly onto the leaf. Steep for five to ten minutes, then strain or remove the bag. That is the entire method. The Ministry keeps a kettle and no thermometer.

A few practical notes the method assumes. You will see filtered or soft water recommended for tea generally, on the grounds that minerals in hard water bind to a tea's polyphenols and dull the cup. That advice was written for Camellia sinensis, and when the mechanism behind it was tested directly on rooibos it did not hold: the mineral film hard water forms on black and green tea never forms on the red bush at any hardness, so for a cup you mean to drink today, plain tap water is very unlikely to be the problem. Warming the pot or cup first keeps the water from dropping below temperature on contact, which matters less for rooibos than for delicate teas but does no harm. And rooibos does not yield much on a second steep the way fine Camellia sinensis leaf does, so it is brewed once, fully, rather than in repeated short infusions.

Use boiling water

A great deal of careful tea advice concerns heat. Green tea wants water well off the boil, white tea cooler still, and a too-hot pour will scorch a delicate leaf into bitterness. None of it applies to red rooibos. It is not a delicate leaf. It is a hardy, needle-fine shrub from the Cederberg, and the red kind has already been oxidised to a deep red-brown before it ever reaches the cup. There is nothing in it to scorch. Water at a full boil is the standard pour, and it is what most producers and the SA Rooibos Council recommend. Slightly cooler water, around ninety degrees (194°F), will still make a fine cup, so a kettle a minute off the boil is no failure. The only temperature that genuinely underperforms is water gone too cold to extract, below roughly eighty degrees (176°F), which leaves the cup thin.

Why it never turns bitter

This is the fact that explains all the rest. The bitterness and the dry, mouth-puckering astringency you can pull from an over-steeped cup of black or green tea come mostly from tannins, the polyphenols that Camellia sinensis carries in quantity and that go on leaching into the water the longer and hotter it steeps. Tannins bind to the proteins in saliva, which is the source of that puckering dryness on the tongue, and they grow more dominant the longer the leaf sits. That is the whole reason ordinary tea is brewed against a clock.

Rooibos has very little of them. It is a different plant entirely, Aspalathus linearis, which South Africa's national biodiversity institute records as caffeine-free and low in tannins, and one comparative study of commercial tea bags measured rooibos far below green tea on both tannins and total phenolics, and modestly below black tea, where the gap is narrower. Figures vary by sample and method, but the consistent finding holds: rooibos sits well below true tea on tannins. With almost nothing in the leaf to turn harsh, a long steep cannot punish the cup. It only makes it stronger, deeper, and a touch sweeter. Rooibos is also naturally caffeine-free, so there is no second clock-watching reason, the bitterness of over-extracted caffeine, to cut the steep short either.

How long to steep

Steeping is the one dial worth setting to taste, and unusually for tea, the wrong setting does no damage.

• Three to five minutes makes a light, clear cup, the colour a clear red.
• Five to ten minutes is the standard, and what most producers suggest: a full, rounded cup, the colour deepening toward mahogany and the woody, honeyed sweetness coming forward. South African reporting on the science lands on the same ten minutes at a full boil as the mark of a "perfect" cup, in the Cederberg's own language as much as anyone's.
• Ten to twenty minutes does no harm at all. A forgotten pot comes back strong but not spoiled.

Longer steeping does more than darken the cup. As rooibos sits, it develops more maltol, a natural flavour enhancer, and vanillin, the compound behind vanilla's sweetness, a point the SA Rooibos Council's chemist makes directly, which is why a longer steep reads as rounder and sweeter rather than harsher. Steep to the strength you like and stop worrying about the rest. It is one of rooibos's quieter kindnesses to the distractible.

Milk, ice, honey, and the red latte

Because there is no astringency to mask, rooibos takes additions gracefully.

• Milk turns it into a soft red latte. With no tannins to curdle against or fight, milk folds in cleanly.
• Honey or sugar suit its natural sweetness, though many drinkers find a long steep sweet enough on its own.
• Lemon brightens it without the bitterness that can sharpen a tannic black tea cut the same way.
• Iced rooibos is excellent. It holds its flavour over ice where a tannic black tea would go cloudy and sharp, because the cold-haze that clouds iced black tea is a tannin-and-caffeine effect rooibos largely lacks.
• As the base of a spiced, milky brew, it stands in happily, calm and caffeine-free.

There is also a coffee-style preparation worth naming. Finely ground rooibos can be run through an espresso machine like coffee, producing a strong, caffeine-free shot with a golden crema that is then built into a "red cappuccino" or "red latte." This is a real, commercial method, pioneered in 2005 by the South African brand red espresso as the first rooibos espresso, not a novelty. None of these additions is required. Drunk plain, rooibos tastes of wood and honey and a faint vanilla, and that is reason enough.

Brewing green rooibos

Green rooibos, the unoxidised kind, is the more delicate of the two: lighter, grassier, and closer to the raw green leaf, with more of its aspalathin intact. It is still rooibos and still low in tannins, so it will not turn bitter on you. It simply has a finer flavour worth protecting, and brewing references give it a slightly lighter hand than the robust red.

• Water slightly off the boil, around eighty-five to ninety degrees (185 to 194°F), suits it better than a hard full boil.
• Steep a touch shorter, four to six minutes, to keep the grassy, delicate character.
• Drink it reasonably fresh rather than stewed for twenty minutes, the one point Carmién Tea makes specifically for the green kind.

The red is the forgiving everyday cup. The green is the one to handle with a touch more care.

The honest limits

Forgiving is not the same as indestructible, and the Ministry deals only in true things. A cup left to stew for an hour, or boiled hard and reboiled, will not turn bitter, but it can turn flat and over-concentrated, the brightness cooked out of it. Low in tannins is not the same as free of them, so a faint astringency at the far end of a very long steep is possible, just never the harsh bitterness of true tea. Water below roughly eighty degrees extracts poorly and leaves a thin cup. And rooibos, like anything brewed, is only as good as the water it is made with.

None of which changes the headline. Within any sane span of time and heat, rooibos needs nothing from the brewer but a kettle and a few minutes. It is, as ever, caffeine-free and rich in antioxidants, which makes it as fit for the last cup of the evening as the first of the morning.