Recipe at a glance
A small fridge-brewed batch to dilute before serving, using Vietnamese coffee or a blend you enjoy.
Yield: 4 small servings after dilution; yield varies with filtration. Total time: 16h10m (approximate).
Ingredients
- 60g coarse-ground coffee
- 360g cold drinking water
- Additional water, milk or ice to dilute each serving
- Optional sweetened condensed milk, added to taste per serving
Method
- Add coffee and water to a clean food-safe covered container and stir until all grounds are wet.
- Cover and steep in the fridge for about 16 hours as a starting point.
- Strain through a fine mesh, then through a suitable paper coffee filter if a cleaner texture is wanted.
- Measure the strained yield and divide into four small portions. Dilute each portion with an equal amount of water or milk to start, taste and adjust. Add condensed milk only if wanted.
- Keep the unsweetened batch covered in the fridge and make a quantity you can use promptly; discard it if its condition is uncertain.
Vietnamese-style cold brew uses Vietnamese coffee or a robusta-led blend in a cold extraction, then serves the concentrate black or with milk. It is an adaptation for batch preparation, not the same process as hot phin coffee poured over ice.
Begin with 60g coarse coffee and 360g cold water, steeped in the fridge for about 16 hours. Strain, measure the yield and divide into several small portions for dilution. Your coffee, filter losses and preferred strength will change the final quantities.
Decide whether you want cold brew or iced phin coffee
| Question | Cold brew | Iced phin coffee |
|---|---|---|
| When can you drink it? | After a long steep | After a short hot brew |
| Main equipment | Covered container and filter | Phin and kettle |
| Routine | Prepare a small batch ahead | Make a serving when wanted |
| Main adjustment | Steep, concentration and dilution | Grind, flow and ice |
If you want a cup now, use the Vietnamese iced coffee recipe. If you want to prepare a few servings for later, cold brew can be convenient in a small kitchen.
Choose beans for the finished drink
A robusta-led coffee is one option for a bold milk drink. Arabica or a blend may suit you better black. Cold extraction does not turn every coffee into the same flavour, so use a manageable quantity before preparing a large batch.
Our Vietnamese bean guide explains roast and species. Choose a coarse grind that can be strained; very fine phin grounds can make filtration slow and leave more sediment.
Wet all the grounds, then leave the batch covered
Use a clean container large enough for the coffee and water. Stir at the beginning to remove dry pockets, cover and refrigerate. Label it with the start time so you are not guessing the next morning.
The 16-hour steep is a baseline. If the coffee is weak even before dilution, extend the next batch modestly or alter the ratio. If it tastes woody or unpleasant, shorten the steep and review the coffee and grind. Do not change every variable together.
Filter without forcing the grounds
Strain through a fine mesh first to remove the main grounds. Use paper filtration afterwards if you prefer a cleaner cup. A filter crowded with grounds can drain slowly, so give it time rather than squeezing vigorously and pushing fine particles through.
Record how much concentrate you collect. The output will be lower than the water added because the grounds retain liquid. Serving calculations should use the collected yield rather than pretending every gram of water reaches the bottle.
Dilute each portion separately
Start with one part concentrate and one part water or milk. For example, combine 60ml concentrate with 60ml water, taste, and add ice if wanted. Condensed milk can be stirred into a small measured portion, but it does not replace all the dilution automatically.
For a coconut version, use the ingredient guidance in coconut coffee, adapting the base carefully. For familiar dairy sweetness, read condensed milk coffee.
Storage and batch size
Prepare a quantity you expect to use promptly, keep it covered in the fridge and handle it with clean equipment. There is no universal home shelf life independent of hygiene, temperature and ingredients. If the condition is uncertain, discard it rather than relying on smell alone to prove safety.
Store coffee separately from milk and mix each drink when serving. A compact bottle is more useful than a large batch occupying the fridge while its freshness declines.
Do not use smoothness to estimate caffeine
A smooth concentrate can still contain substantial caffeine. The caffeine guide explains why coffee dose, extraction and serving matter more than perceived harshness. Divide the batch intentionally and dilute for flavour without assuming that dilution removes caffeine.
Return to the Vietnamese coffee hub if you want to compare this adaptation with phin brewing, black coffee and other milk drinks.
Frequently asked questions
Is cold brew the same as Vietnamese iced coffee?
No. Classic iced phin coffee is brewed hot and then served over ice. Cold brew extracts grounds in cold water over a much longer period.
Should I drink the concentrate neat?
The recipe is intended for dilution. Start with equal parts concentrate and water or milk, then adjust to taste.
Is cold brew low in caffeine?
Not necessarily. Dose, extraction and how much concentrate you drink matter. A smooth taste does not establish low caffeine.
Can I add condensed milk to the stored batch?
It is more practical to store the coffee separately and add milk when serving. That leaves control over sweetness and avoids treating a mixed dairy drink as plain stored coffee.