Vietnamese Cold Brew at Home: A Simple Guide

Why Vietnamese Cold Brew?

Traditional cà phê sữa đá is made fresh with a phin filter — but what if you want to make it for a crowd, or have it ready in the morning without waiting 5 minutes? Vietnamese cold brew concentrate solves this. You make a large batch overnight, then serve it over ice with condensed milk in seconds. It's also smoother and less acidic than hot-brewed phin coffee.

The Cold Brew Ratio

For Vietnamese cold brew, use a stronger ratio than typical cold brew: 1:5 coffee to water (e.g., 100g coffee to 500ml cold water). This produces a concentrate that, when mixed with condensed milk and ice, delivers the same bold flavor as a fresh phin brew.

Equipment

• Large mason jar or pitcher (1L+)
• Fine mesh strainer or cheesecloth
• 100g coarsely ground Vietnamese coffee
• 500ml cold filtered water

Step-by-Step

1. Combine coffee grounds and cold water in your jar. Stir to ensure all grounds are saturated.
2. Cover and refrigerate for 12–18 hours. Longer = stronger and smoother.
3. Strain through a fine mesh strainer lined with cheesecloth into a clean jar. Discard grounds.
4. Store concentrate in the fridge for up to 2 weeks.

Serving

To serve: add 1–2 tbsp condensed milk to a glass, pour 60–80ml of concentrate over it, fill with ice, and stir. Adjust concentrate-to-ice ratio to your preference. For a lighter drink, dilute with a splash of water or oat milk.

Tips

• Use Robusta-heavy beans. The higher caffeine and bolder flavor of Robusta holds up better in cold brew than Arabica.
• Grind coarse. Fine grinds make cold brew muddy and over-extracted. Aim for a coarse, even grind.
• Don't rush the steep. 12 hours is the minimum. 18 hours produces a noticeably smoother concentrate.
• Taste before adding condensed milk. The concentrate should be bold but not bitter. If it's bitter, you steeped too long or ground too fine.

If you'd prefer a ready-made cold brew, our menu features Vietnamese cold brew concentrate year-round. Wholesale cold brew is also available for cafes and restaurants.

Troubleshooting Your Cold Brew

Cold brew is forgiving, but a few common mistakes can affect the result. If your cold brew tastes bitter, you likely steeped too long or ground too fine — try 12 hours with a coarser grind. If it tastes weak or watery, your ratio is off or you didn't steep long enough. If it tastes sour, the beans may be under-roasted for cold brew; Vietnamese-style dark roast Robusta works best.

Vietnamese Cold Brew vs. Regular Cold Brew

Factor	Vietnamese Cold Brew	Standard Cold Brew
Bean type	Robusta or Robusta-Arabica blend	Usually Arabica
Ratio	1:5 (concentrate)	1:8 to 1:10
Steep time	12–18 hours	18–24 hours
Caffeine	Very high (Robusta)	Moderate
Flavor	Bold, chocolatey, earthy	Smooth, mild, fruity
Served with	Condensed milk + ice	Usually black or with milk

Scaling Up for Meal Prep

One of the biggest advantages of cold brew is how well it scales. A single batch using 200g of coffee and 1 litre of water makes enough concentrate for 12–15 servings. Store it in a sealed glass jar in the refrigerator — it keeps for up to two weeks without any loss of flavor. This makes Vietnamese cold brew an ideal option for meal preppers, office coffee setups, and anyone who wants a great iced coffee ready in seconds every morning.

Dairy-Free and Vegan Variations

Traditional cà phê sữa đá uses sweetened condensed milk, but several dairy-free alternatives work well. Oat milk condensed milk (available at most Asian grocery stores) is the closest in texture and sweetness. Coconut condensed milk adds a subtle tropical note that pairs beautifully with Vietnamese Robusta. For a lighter option, a splash of oat milk and a teaspoon of maple syrup creates a clean, naturally sweet result.

Frequently Asked Questions

How long does Vietnamese cold brew take?

Vietnamese cold brew steeps for 12–24 hours in the refrigerator. A longer steep (18–24 hours) produces a more concentrated, chocolatey brew.

What coffee should I use for Vietnamese cold brew?

Use a coarse-ground Robusta or Robusta-Arabica blend for the most authentic flavour. Hanoi Drip's Signature Blend or Dark Roast work well.

Can I use a phin filter for cold brew?

Yes — place the phin over a glass, add coarsely ground coffee, pour cold water slowly, cover, and refrigerate overnight. The result is a smooth, concentrated cold brew.

How do I serve Vietnamese cold brew?

Serve over ice with sweetened condensed milk for the classic cà phê sữa đá style, or black over ice for a cleaner, more intense flavour.