What cold brew is and why it tastes different
Cold brew is made by steeping coffee in cool or room temperature water for many hours, then straining it before serving. Because the water never gets hot, the coffee is usually softer, less acidic and naturally sweeter than a hot brew. That makes it a good choice for hot summer days in Cape Town, for long office hours in Johannesburg, or for keeping a ready-to-pour coffee concentrate in the fridge.
It is not the same as iced coffee. Iced coffee is normally brewed hot first, then chilled. Cold brew takes longer, but the result is steadier and easier to batch. It also handles milk, tonic water or extra water very well if you want different serving styles through the week.
If you want a café-style result at home, start with a medium to coarse grind, clean water and a container with enough space for the coffee to expand. Avoid fine grounds because they can make the brew muddy and harder to filter.
What you need before you start brewing
You do not need specialised equipment, but the basics must be clean and measured properly. A kitchen scale helps a lot, especially when you want the same result each time. For home kitchens, glass jars, jugs or food-safe buckets work well. In offices, a larger container with a lid is useful for batch brewing and easier storage in the fridge.
- Ground coffee, medium to coarse
- Cold or room temperature filtered water
- A clean jar, jug or food-safe container
- A sieve, filter cloth or paper filter
- Kitchen scale and measuring jug
- Fridge space for storage
Use fresh coffee. If the beans are too old, the brew can taste flat no matter how carefully you steep it. For coastal areas such as Woodstock, the Atlantic Seaboard and Gqeberha, keep the container covered so the coffee does not pick up fridge odours or moisture.
The simplest cold brew ratio for home use
A reliable starting point is 1 part coffee to 8 parts water for a ready-to-drink brew, or 1 part coffee to 4 or 5 parts water if you want a concentrate. Concentrate is better for busy households and office kitchens because it saves fridge space and lets each person dilute their cup to taste.
For example, use 100 g coffee with 800 ml water for ready-to-drink brew, or 200 g coffee with 1 litre water for a concentrate. If you are serving guests or staff, make a slightly stronger batch first. It is easier to dilute a strong brew than to rescue one that is too weak.
Check your grind before you begin. It should look a bit coarser than filter coffee, closer to coarse sea salt. Too fine and the result can be bitter or sludgy, especially if the brew sits longer than planned.
- For a lighter cup: 1:10 ratio
- For everyday drinking: 1:8 ratio
- For concentrate: 1:4 or 1:5 ratio
Step by step brewing method
Place the coffee in your container and pour over the water slowly, making sure every ground is wet. Stir once or twice with a clean spoon to break up dry pockets. Put on the lid or cover the top with a clean cloth and leave it to steep at room temperature or in the fridge.
Room temperature steeping usually takes 12 to 16 hours. Fridge steeping is slower and can take 16 to 20 hours. If your kitchen gets warm in Durban or Pretoria, the fridge is often the safer option. In cooler weather, a covered container on the counter can work well, just keep it out of direct sunlight.
After steeping, strain the brew through a sieve first, then filter it again if you want a cleaner cup. A paper filter removes more sediment, while a cloth filter keeps more body. Let it drip without rushing because squeezing the grounds can push bitter fines into the liquid.
- Wet all the grounds evenly
- Stir gently, not aggressively
- Steep 12 to 20 hours
- Strain twice for a cleaner result
How to serve cold brew without wasting flavour
Once filtered, your cold brew concentrate can be kept in a sealed container in the fridge for up to 5 days. If you made a ready-to-drink batch, drink it within 3 days for best flavour. Always taste before serving. If it smells flat or sour, do not serve it.
To serve concentrate, start with one part cold brew to one part water or milk, then adjust to taste. Some people prefer it stronger, especially over ice, while others want a lighter cup with oat milk or full cream milk. For offices, label the container with the brew date and dilution note so staff do not guess.
You can also use cold brew in a few simple ways:
- Over ice with a splash of water for a clean black coffee
- With milk for a smoother breakfast drink
- Mixed with tonic water for a sharper, refreshing serve
- As an ingredient in iced coffee recipes and coffee-based desserts
If you are serving it in a meeting room or hospitality space, keep extra ice in a separate container and top up only as needed. That keeps the flavour stable and helps avoid watering it down too quickly.
Fixing common problems before your next batch
If the brew tastes weak, use more coffee or grind slightly finer next time. If it tastes bitter, shorten the steeping time or use a coarser grind. If the texture is muddy, strain more carefully and avoid shaking the container before pouring. Small changes make a big difference, especially when you are brewing for multiple people.
Load-shedding can interrupt fridge space, so it helps to batch brew in a cool room and strain as soon as the steep time is up. Then move the finished brew into the fridge in a sealed bottle or jar. If you are running coffee for staff, clients or a wellness room, make smaller batches more often rather than trying to hold one large batch too long.
- Weak cup: increase coffee or steep a little longer
- Bitter cup: use coarser grind or shorter steep
- Cloudy cup: filter again through paper
- Stale taste: use fresher coffee and clean containers
For hospitality venues and offices with regular demand, a proper stock plan helps. A steady cycle of brewing, labelling and chilling saves time and keeps the coffee tasting consistent through the week.
A simple checklist for repeatable results
Before each batch, do a quick check so the process stays easy. Cold brew rewards consistency more than speed, and a few habits will keep the flavour clean from one batch to the next.
- Use fresh coffee and clean equipment
- Measure coffee and water by weight
- Choose the right grind, not too fine
- Steep for the same time each batch
- Strain well and store in a sealed container
- Label the brew date and dilution ratio
If you want help choosing beans for cold brew, or need support with office coffee supply, brew training or subscription planning across Cape Town, Johannesburg, Pretoria, Durban and Gqeberha, use the enquiry form on our contact page. A good cold brew setup is simple once the ratio and routine are right, and it can save a lot of time on warm days.
