Iced Vanilla Cold Brew

Cold brew coffee shines due to its lack of bitterness, making it the ideal base for a Slushi to achieve a smooth drink without the acidity of chilled espresso. My first attempt with pure cold brew actually turned into a solid block of ice: it lacks the sugar needed to set correctly. By pairing it with a flavoured syrup, you get a fresh, caffeinated slush texture that is easy to drink through a straw. It is the perfect alternative to the sometimes overly heavy preparations from large chains, which you can adjust to your own preferences.

Vanilla Iced Cold Brew

Recipe by Camille RoosCourse: Frappé / coffeeCuisine: AmericanDifficulty: Easy

Servings

4

people

Prep

5

minutes

Freeze time

45

minutes

Total time

50

minutes

A cold-infused coffee transformed into a vanilla-flavoured frozen slush, smooth and completely free of bitterness.

Ingredients

• 850 ml cold brew coffee (homemade, brewed for 18h, or bottled)

• 150 ml vanilla syrup (or simple cane sugar syrup)

Instructions

• Mix the cold brew concentrate and the vanilla syrup in a pitcher until the liquid is well combined. The sugar in the syrup prevents the coffee from freezing into a hard block.
• Pour the mixture into the vessel of the Ninja Slushi. The one-litre volume ideally sits between the min and max fill lines.
• Select the Frappé programme (FS301) or Milkshake (XL and Max) and let the machine run until you achieve a caffeinated slush texture (about 45 minutes).
• Serve immediately in tall glasses. You can add a splash of oat milk or cream directly on top when serving.

Iced Cold Brew Latte

For a coffee-shop style version, replace 200 ml of cold brew with 200 ml of milk (dairy or plant-based) in the initial mix and use the Milkshake programme.

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The importance of sugar to avoid a coffee block

I love bitter black coffee, but in the Ninja Slushi, it is a technical heresy. The water contained in pure coffee freezes at zero degrees and forms a giant ice cube that will jam the auger of your machine. This is where vanilla syrup comes in: sugar lowers the freezing point of your preparation. With about 150 millilitres of syrup for a total of one litre, you ensure the drink remains fluid and takes on that famous slush consistency drinkable with a straw. If you prefer a less vanilla-heavy result, use a neutral cane syrup, but never completely remove the sugar content. Two beeps per minute with temperature lights turning on one by one from top to bottom indicate a lack of sugar.

Homemade brew or store-bought bottle?

The choice of base coffee makes all the difference. I have often tested cooling a large volume of espresso or hot filter coffee: the result is systematically acidic once frozen. Cold brew, steeped in cold water for 12 to 18 hours, offers a roundness and lack of acidity that withstands low temperatures perfectly. You can buy a bottle of ready-to-use concentrate to save time, or prepare it yourself by coarsely filtering coffee grounds that have been soaking in water since the day before. The essential part is to filter the grounds well so you don’t have small residual grains in the vessel of the Slushi, which would spoil the smoothness of the drink on the palate.

Variations and other daytime drinks

If you enjoyed this method, the machine allows you to explore other very refreshing non-alcoholic bases. When I host in the afternoon, I often offer fruity alternatives for those avoiding caffeine. You can, for example, try a frozen red fruit smoothie, which offers a lovely texture, ideal for waking up or for an afternoon snack. If you prefer more floral notes, the non-alcoholic frozen lychee is an excellent, light option for the middle of the day. The technical principle always remains the same: balance the liquid base with a sweetening agent to achieve the right set in the cold, regardless of the flavour chosen.

Do you prefer your cold brew black or softened with a splash of plant-based milk?

Frequently asked questions

Why does my coffee turn rock-hard in the machine?

It simply lacks sugar. Pure coffee freezes exactly like water. Add more syrup to allow the mixture to remain fluid and set gently.

Can I use regular chilled coffee instead of cold brew?

Yes, but hot-brewed coffee naturally develops an acidity that stands out once the drink is very cold. Cold brew guarantees a much rounder flavour.

Which programme should I choose if I don’t have the FS301?

The XL and Max models do not have the Frappé button. Run the Milkshake programme: the texture will be slightly less thick, but very similar.