How to serve cold brew coffee with bubbles

In this article, you’ll learn:

• How to prepare coffee for nitro brewing
• Why a nitro dispenser is suitable for serving cold brew coffee on tap
• How you can make dispensing more efficient with equipment

Cold brew coffee is one of the most popular menu items for specialty coffee shops – and serving it on tap as nitro cold brew can create a higher-margin offering. Nitro cold brew is known for its cascading effect, creamy mouthfeel, and naturally sweet flavour profile. It’s also widely considered a premium item that retails for more than other cold coffee drinks.

In practice, “cold brew coffee with bubbles” typically refers to nitro cold brew, which is infused with nitrogen rather than carbon dioxide. This creates a smooth, creamy texture rather than the sharp effervescence associated with carbonation.

However, knowing how to prepare and serve cold brew coffee with bubbles can be difficult. Since its consistency is different to that of still cold brew, you often need specialised equipment. While this can make service more complicated, it can also pay dividends for future sales and menu expansion.

To learn more about how to serve cold brew coffee with bubbles – and which kind of coffee works best – I spoke to Ernest Igual. He is the co-founder of St Dreux Coffee, a roastery based in Australia. Read on for his insight.

How to prepare coffee for nitro cold brew service

The foundation of serving cold brew coffee with bubbles lies in the quality and preparation of the coffee itself. While nitrogen infusion transforms texture and presentation, it cannot compensate for inconsistencies or flaws in the underlying extraction.

Grind size is one of the most critical variables. “Generally, I grind coarse,” Ernest tells me. “I tend to use a coarse grind similar to what I would use for a V60, or a little coarser.”

This is important because the grind size of coffee can significantly influence how it is extracted for cold brew. “Grind size determines the extraction rate, together with the brew time,” he says. “To get the best out of a particular coffee, you need to get the right combination of grind size and brew time. Simply put, too coarse can lead to underextraction, and too fine can lead to overextraction.”

Without getting the grind size right, your cold brew coffee with bubbles may taste inconsistent and disappoint repeat customers. “For example, using too fine a grind can lead to dry pockets and the risk of muddiness in the coffee,” he says. 

Fortunately, there are ways to balance out these concerns. For instance, increasing the agitation of your cold brew helps to increase extraction if you grind too fine. In general, though, working to a grind size of 450 to 500 microns is usually best.

Above all, though, Ernest believes that constantly trying new extraction profiles, grind sizes, and brew times can help you find the sweet spot. “Experiment!” he says. “You can influence which characteristics of the coffee are emphasised by trying different grind sizes and brew times.”

“Brew faster to enhance nuance and go slower to emphasise body and sweetness,” he continues. “Play with different combinations of grind size and brew time to find your preferred settings. It’s a really enjoyable way to brew and drink coffee.”

How to dispense nitro cold brew coffee

Once you’ve prepared cold brew, the dispensing system is the defining factor in achieving the cascading nitro effect. Rather than just being carbonated coffee, cold brew coffee with bubbles uses nitrogen gas to create a dense, creamy texture to stand out.

Dedicated systems such as the Hardtap nitro dispenser are particularly useful for dispensing cold brew coffee with bubbles. Designed specifically for drinks service, it infuses drinks with atmospheric nitrogen to create microfoam as it exits the tap.

From an operational perspective, this is a more convenient way to dispense cold brew coffee with bubbles than relying on external kegs. Not only can you save money on needing to re-order kegs when your nitrogen supply runs out, but you can also reduce the space needed for equipment and add-ons to serve cold brew coffee with bubbles.

Temperature control is equally important when offering cold brew coffee with bubbles. Nitro cold brew is typically served at lower temperatures than standard iced coffee, often between 2°C and 4°C. The Hardtap system is designed to integrate with inline cooling systems, allowing you to hit a target serving temperature between 3ºC and 10ºC.

Another important feature is its compatibility with batch-produced cold brew. Compared to manual methods, which take between 12 and 24 hours to prepare a batch, your nitro cold brew dispenser can connect to dedicated cold brew machines like the Baby Hardtank. This means you can prepare a batch of cold brew in under an hour and then dispense it from the same line, allowing for seamless service.

Ease of use is another benefit of serving cold brew coffee with bubbles. The Hardtap, for instance, features pre-programmed dosing based on volumes you select, meaning all staff need to do is select the right option on the touchscreen display.

Ultimately, dispensing cold brew coffee with bubbles is about control and consistency. Whether you use the Hardtap or any other dedicated dispensing system, it should allow for repeatable serving sizes, easy use, and convenient, keg-free operation.

Do consumers prefer cold brew coffee with bubbles?

Once you’ve determined the right grind size and equipment for serving cold brew coffee with bubbles, you can tap into a trending and highly profitable drink.

The rise of nitro cold brew is closely tied to broader shifts in consumer preferences. Today’s coffee consumers want experiences that go beyond flavour alone – prioritising texture, visual appeal, and perceived quality.

Nitro cold brew meets all of these expectations by introducing a unique sensory element. The cascading effect and creamy head create a visually engaging drink that aligns with trends seen in craft beer and draught cocktails. This can enhance perceived value, allowing you to position nitro cold brew as a premium product with a higher value – and as such, higher margins. In fact, coffee shops on average can charge up to $2 more for nitro compared to still cold brew, making it a valuable way to expand your profits.

Equipment plays a key role in meeting these expectations. Systems like the Hardtap allow coffee shops to serve consistent, high-quality cold brew coffee with bubbles that match consumer expectations. Moreover, the ability to serve it on tap allows you to be much more efficient. The equipment significantly reduces the preparation time per drink, allowing staff to serve customers more quickly during busy periods. This is particularly valuable in high-traffic environments such as coffee shops and quick-service restaurants.

Evidently, investing in equipment to serve cold brew coffee with bubbles can be a significant growth and revenue opportunity. With a system like the Hardtap, you can expand your drinks menu with quick, efficient service for high-margin beverages.

Cold brew coffee with bubbles: Key takeaways

• Cold brew coffee with bubbles is a premium, high-margin drink that often commands higher prices than still cold brew.
• A coarse grind is typically best to ensure a clean, consistent flavour for your nitro cold brew.
• Investing in equipment to dispense cold brew coffee with bubbles is the best way to consistently and efficiently serve it on-site.

Ready to invest in equipment to dispense cold brew coffee with bubbles? Learn more about the Hardtap here and arrange a consultation with the Hardtank team.

Cold brew coffee with bubbles FAQ

What grind size is best for nitro cold brew?

Aim for a medium-coarse grind size, slightly coarser than filter coffee. This helps to ensure even extraction over long brew times.

What equipment do you need to serve nitro cold brew with bubbles?

Typically, you need a nitro dispensing system or tap, such as the Hardtap. You may need an external nitrogen gas tank as well.

Is nitro cold brew more profitable than regular cold brew?

Often, nitro cold brew is positioned as a premium product that can be placed at a higher price point than still cold brew.

Want to learn more about serving cold brew with bubbles?

• Explore our technology: Read up on the Hardtap here.
• See it in action: Watch our equipment demonstration.
• Speak to an expert: Contact the Hardtank team.