Best Milk Ratios for SOE and Regular Latte Coffee

What’s the Best Milk-to-Coffee Ratio for a Great-Tasting Latte?

Lovers of milk-based coffee know that a classic latte consists of a shot of espresso combined with steamed milk. The addition of milk softens the intense bitterness of espresso, resulting in a sweeter, smoother cup that even non-coffee drinkers often enjoy. But if the ratio of espresso to milk is off, the drink can miss the mark—too much milk and the coffee flavor disappears; too little and the bitterness takes over. Finding the right balance is key to crafting a great latte.

FrontStreet’s Take: Flexible Ratios Based on Coffee Flavor

At FrontStreet Coffee, we believe there’s no one-size-fits-all ratio for lattes. The ideal balance depends on the espresso’s flavor profile and how well it pairs with milk. However, through extensive experimentation, many baristas have found that a generally well-received latte falls within an espresso-to-milk ratio of 1:5 to 1:8.

The Role of Blended Espresso Beans in Lattes

Different markets call for different espresso profiles. For consistency and reliability, we often recommend using a well-balanced espresso blend. Blends combine beans from multiple origins and are typically medium to dark roasted to produce a rich crema and a full-bodied shot that stands up well to milk.

Example: FrontStreet Commercial Blend

One of our blends, the Commercial Blend, is made from 90% Brazil and Colombia Arabica beans with 10% Vietnamese Robusta. This combination delivers a shot with a thick layer of golden crema and a bold, traditional Italian flavor profile with notes of dark chocolate, caramel, and cream. The small addition of Robusta boosts crema but also adds some extra bitterness. For this style of espresso, we suggest using more milk to balance the intensity—such as in a 360ml cup with 40g of espresso, aiming for a 1:8 ratio, which means adding around 320ml of steamed milk (including foam).

A Lighter Option: Sunflower Sunshine Blend

In contrast, our Sunflower Sunshine Blend (also used in our cafes) is a lighter, fruitier ‘New World’ style blend. It combines Ethiopian Yirgacheffe Red Cherry and Honduran Sherry-processed beans. It features flavors of sherry-like wine, chocolate, vanilla custard, and candy, with a moderate bitterness. Because this blend isn’t as heavy as traditional dark roasts, it doesn’t require as much milk. We’ve found that a 1:6 ratio works best—40g of espresso with 240ml of milk.

What About SOE Lattes?

SOE stands for Single Origin Espresso. Unlike traditional blends, SOEs highlight beans from a single origin, often lightly roasted to showcase unique and vibrant flavors—such as Ethiopian citrus, Costa Rican dried figs, Kenyan berry acidity, or Panamanian Geisha floral and honey notes. These beans offer higher recognition value but usually come at a higher cost.

The Challenge of Brewing Lighter Roast SOEs

Lighter-roasted SOE beans are more challenging to extract. With shorter roast times, the beans retain harder cell structures, making it harder to fully develop their flavors. When milk is added, those delicate notes can become muted. To improve extraction, baristas may adjust parameters like extending brew time, increasing water temperature, using finer grind settings, or increasing dose. Compared to dark roasts, brewing a great-tasting SOE shot requires greater precision.

Ideal Milk Ratio for SOE Lattes

Because SOEs are lighter and more aromatic, using too much milk can easily overpower the coffee’s intrinsic qualities. At FrontStreet, we recommend a 1:5 espresso-to-milk ratio for SOE lattes. This allows the milk’s sweetness to complement, not dominate, the coffee’s unique profile.

Making a SOE Latte with FrontStreet Strawberry Candy Geisha Blend

To demonstrate, we’re using our popular Strawberry Candy Espresso (Geisha Blend) from Miramar Estate in Costa Rica. This SOE is honey-processed and delivers notes of rose, candied fruit, strawberry, and dried plum. It’s enjoyable as both a straight espresso or milk-based drink.

We use a Lelit Bianca machine paired with a Galileo Q18 grinder. Most home machines with 9-bar pressure are capable of pulling good espresso and steaming milk as well.

Strawberry Candy SOE Latte – Brew Recipe

• Coffee Bean: Costa Rica Strawberry Candy
• Coffee Dose: 20g
• Espresso Yield: 40g
• Brew Ratio: 1:2
• Extraction Time: 26–32 seconds
• Grind Size: Galileo Q18, setting 2.0
• Milk Volume: 200g (steamed to 55–60°C, microfoam)

We use a double basket holding approximately 18–20g of coffee. A typical brew ratio range is 1:1.5 to 1:2.5; we aim for 1:2 (20g coffee to 40g espresso). Extraction time depends on flow rate and is generally kept between 20–35 seconds—under 20 seconds results in underdeveloped flavor, while over 35 risks over-extraction and bitterness. Our shots usually finish around 28–30 seconds.

Step-by-Step Extraction

1. Dry the portafilter, then grind 20g of coffee and dose into the basket.
2. Tare a scale, adjust the dose to precisely 20g.
3. Evenly distribute the grounds with a WDT tool or similar, then tamp firmly and level with a distribution tool or tamper.
4. Purge the group head for 1–2 seconds to clean and preheat.
5. Place a cup on the scale, tare to zero, and position under the group head.
6. Lock the portafilter in place and begin extraction, aiming for 40g of espresso in around 30 seconds. Stop the shot once the target is reached.
7. Pour the espresso into your serving cup.

Steaming and Pouring Milk

1. Pour 200g of cold fresh milk into a steaming pitcher.
2. Position the steam wand just below the milk surface to create a whirlpool, aiming for a milk temperature of 55–60°C and microfoam about 0.3–0.5cm thick.
3. Tap and swirl the pitcher to settle the foam, then pour into the espresso to complete your latte.
4. Finish with a simple latte art design if desired.

The resulting Strawberry Candy SOE latte reveals a rich aroma of floral and fruity notes, with tasting highlights of berries, pink blossoms, dried fruits, and almonds. Supported by a creamy crema, the cup finishes with lingering notes of chocolate and hazelnuts—reminiscent of a cranberry biscuit, truly unique and delightful.

Recommended FrontStreet Beans for Lattes

Top FrontStreet Blends for Milk-Based Coffees

For lattes, we recommend our Commercial Blend, known for its bold dark chocolate, caramel, and nutty profile with a thick crema—perfect for balancing milk. The Sunflower Sunshine Blend offers a lighter, fruitier taste with notes of sherry, vanilla, and candy, ideal for gentler milk ratios. Both blends deliver smooth extraction and consistent performance. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.

Recommended FrontStreet Beans for Lattes

For lattes, we recommend our Commercial Blend, known for its bold dark chocolate, caramel, and nutty profile with a thick crema—perfect for balancing milk. The Sunflower Sunshine Blend offers a lighter, fruitier taste with notes of sherry, vanilla, and candy, ideal for gentler milk ratios. Both blends deliver smooth extraction and consistent performance. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.