Roselle tea is meant to be tart, but if yours makes you wince, the cause is almost always the brewing: too much roselle, too long in the water, a concentrate drunk undiluted, or sugar added too late to dissolve. Roselle gives up its acid very quickly, so small changes make a big difference. Here is how to tell which one it is.
Is roselle tea supposed to be sour?
Yes. What you brew is not the petal but the calyx, the fleshy red cup around the seed pod, and it is naturally rich in fruit acids, mainly hibiscus acid and citric acid. That is why roselle tastes closer to cranberry or sour cherry than to a floral tea. The same calyces are sold as “hibiscus” around the world, and they make other famously tart drinks too: agua de jamaica in Mexico and bissap in West Africa, both sweetened generously.
Unsweetened, it is bracing. In Thailand it is almost never drunk that way: nam krachiap is sweetened generously, and the sweetness is what makes the sharpness taste refreshing rather than harsh.
How much dried roselle should you use?
About 10g per litre, or 2–3 calyces per mug. Roselle is far more concentrated than most dried flowers, so the amount that looks right in the pot is usually too much. If your cup is sour and very dark, use less roselle next time before changing anything else.
Does steeping roselle longer make it more sour?
Yes, and faster than you might expect. The colour is fully out within about two minutes, which tempts people to think the tea is done extracting. It is not: the acid keeps coming. For a drinking-strength cup, steep 5–8 minutes in water just off the boil, then strain the calyces out rather than leaving them in the pot.
Simmering is a different drink. Market-stall roselle is simmered hard to make a concentrate, sweetened heavily and then diluted with water and ice. Drink that concentrate straight and it will be very sour indeed.
Why does sugar not fix sour roselle tea?
Usually because it went in too late. Sugar stirred into a cold, acidic drink dissolves slowly and sinks, so the tea on top still tastes sharp. Sweeten while the infusion is hot, stir until it disappears, and then chill it. Honey works well too; stir it in once the tea has cooled slightly.
Is cold-brewed roselle less sour?
It tastes noticeably less aggressive. A cold brew still has roselle’s colour and fruit, but the sharp edge is softer than in a hot brew. Use about 5g per 500ml of cold water and leave it in the fridge for 8–12 hours; the full method is in our guide to cold brewing Thai botanicals.
Ways to soften it
- Skip the lemon. Roselle already has plenty of acidity. A slice of lime adds more sourness, not balance.
- Add something sweet and aromatic. A bruised stalk of lemongrass in the jug while it chills, a few slices of ginger, or a cinnamon stick all round out the edges.
- Dilute it. If a jug came out too strong, add cold water and ice rather than more sugar. It will still be deep red.
And remember the colour: roselle’s red comes from anthocyanins, which stay red in acid. A very dark cup is usually a strong one.