Keto Vietnamese Coffee Cà Phê Sữa Đá

⏲ ~8 min total · prep 4 · cook 4 · 1 servings

By the KFI Test Kitchen · Tested & approved by Jason Lieu, KFI recipe editor

Published Sep 15, 2026 · Updated Sep 15, 2026

Ingredients

• 2 tbsp coarsely ground dark-roast coffee (Vietnamese roast if you have it)
• 2 tbsp boiling water, plus more for the phin drip
• 1 1/2 tbsp granulated allulose (dissolves cleanly when cold)
• 6 oz ice cubes, made from filtered water
• 3 tbsp heavy cream
• 2 tbsp unsweetened almond milk
• 1 drop vanilla extract (optional)

Instructions

1. Stir the allulose into the 2 tbsp boiling water in a small glass until fully dissolved; this is your sweetener base so no grit sinks to the bottom of the finished drink.
2. Unscrew the filter plate of a 4-oz phin filter, add the coffee, and shake once to level the grounds. Screw the plate back just until snug — over-tightening chokes the drip.
3. Set the phin over a 10-oz heatproof glass filled with the ice. Pour in a splash of hot water to bloom the grounds for 20 seconds, then fill the chamber to the top with boiling water.
4. Let it drip undisturbed, 4-5 minutes total, until the chamber runs nearly dry and the glass holds about 3 oz of concentrated coffee over the ice.
5. While it drips, shake the heavy cream and almond milk in a small jar 15 seconds until lightly thickened but still pourable.
6. Pour the cream mixture over the coffee, stir once, and serve immediately while the ice is still crackling.

Why this recipe works

• The phin drip concentrates A 4-5 minute slow drip builds about 3 ounces of intense coffee that stands up to a full glass of ice. Brewed weak and poured over ice, it would taste like cold water by the second sip.
• Allulose dissolves clean Granulated allulose stirs fully into the 2 tablespoons of boiling water as a base, so no grit settles at the bottom of the glass as the drink sits. Cold-stirred sweetener leaves sand.
• Shaken cream, still pourable Fifteen seconds in a jar lightly thickens the cream and almond milk so it ribbons into the coffee instead of vanishing. Over-shaken cream turns to spoonfuls.

Tips for making this recipe well

Snug, not tight

Screw the phin's filter plate back until it barely resists. Over-tightening compresses the grounds and chokes the drip to a trickle that never finishes.

Bloom first

A splash of hot water on the grounds for 20 seconds before filling the chamber releases trapped gas and evens out the extraction. Fill it dry and the water channels straight down the sides.

Ice counts as an ingredient

The 6 ounces of filtered-water ice chills and dilutes the concentrate to drinking strength in one move. Less ice means a drink that turns strong and bracing as it sits.

Dissolve the sweetener hot

The 2-tablespoon boiling-water base is what keeps allulose from pooling at the bottom. Stir until the glass runs clear before anything else goes in.

Serve while it crackles

Pour the cream, stir once, and drink while the ice is still loud. This drink is built for its first three minutes and declines from there.

Serving suggestions

Afternoon in a warm kitchen, ten minutes to spare, and this is the drink we make. It works as an after-lunch coffee, a dessert for one at 1.4 net carbs, or the thing you hand a guest who doesn't want wine. The 3 tablespoons of cream and 2 of almond milk make it rich without the sugar that traditional condensed milk carries, and the dark roast holds its edge through all that ice. Serve it in the glass it drips into, condensation and all, with a long spoon for the cream at the bottom.

Storage and meal prep

This is a drink to make and drink, not store, since the ice melts and thins the coffee within minutes. What keeps is the sweetener base: stir a larger batch of allulose into boiling water, jar it, and it holds a week in the fridge for drink after drink. The cream and almond milk mixture is best shaken fresh, though it holds a day covered in the fridge with a good re-shake. Spent grounds go to the compost once the chamber cools.

Variations worth trying

• Dairy-free Use full-fat canned coconut milk in place of the heavy cream. It shakes the same way and leans the drink tropical.
• Hot version Skip the ice, warm the cup, and pour the cream mixture into the hot concentrate. Same layers, no dilution.
• Decaf after dark Brew the same 2 tablespoons of decaf dark roast in the phin. The ritual survives the caffeine cut.

Frequently asked questions

What if I don't own a phin filter?

Brew a strong small batch in a pour-over cone or an AeroPress, aiming for about 3 ounces of concentrate. The phin's slow drip is traditional, but the drink needs intensity more than the exact device.

Why allulose instead of condensed milk?

Condensed milk is the traditional sweetener but carries a load of sugar that ends the keto math. Allulose dissolves cleanly, even cold, and keeps the drink at 1.4 net carbs.

My drip ran fast and weak. What happened?

The filter plate was too loose or the grounds were ground too coarse. Snug the plate until it barely resists and use an even, coarse dark-roast grind.

Can I use another milk?

The recipe's 3 tablespoons of cream and 2 of almond milk balance richness against dilution. Coconut milk or another unsweetened milk swaps in, though very thin milks vanish into the coffee.

How strong is the coffee?

Deliberately strong: 2 tablespoons of dark roast drip into a concentrate that the ice then dilutes to drinking strength. If the first sip tastes intense, that's by design, and the ice softens it as you drink.

Related keto recipes

Dinner

Best Keto Eggnog

13 min · 3.1g net carbs

Dinner

Keto Cold Coconut Breakfast Cereal

18 min · 6.7g net carbs

Dinner

Keto Blue Cheese Dressing

47 min · 1.8g net carbs

Dinner

Keto Chocolate Covered Buttercream

14 min · 1.4g net carbs

As an Amazon Associate and affiliate partner, Keto Food Ideas earns from qualifying purchases at no additional cost to you. Nutritional values are estimates. Recipes are developed with AI assistance and reviewed by our editors before publishing.

← More Dinner recipes · Home