Posted on May 9th, 2026

How We Make Cold Brew at Evolution Coffee Roasters

Cold brew becomes exceptional when decisions are intentional rather than convenient. At Evolution Coffee Roasters, our cold brew process reflects the same principles we apply to roasting: understanding the coffee, controlling variables, and refining with purpose.

This article shows how we apply cold brew fundamentals in practice, including intentional coffee selection, designed blends, controlled extraction baselines, and disciplined refinement. These are not abstract ideas; they are the decisions that shape every batch we make.

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Cold Brew Series: Applying the Fundamentals at Evolution Coffee Roasters

This article brings together the concepts explored throughout our Cold Brew education series and shows how we apply them in our own workflow.

• Why Cold Brew Starts With the Coffee, Not the Method
• Best Coffee Beans for Cold Brew: Origins, Blends & Balance
• Processing Matters More Than Origin for Cold Brew
• Grind ing, Ratios, and Time: How Variables Shape Cold Brew
• Roast Level and Cold Brew: How Light, Medium, and Dark R eally Behave
• How We Make Cold Brew at Evolution Coffee Roasters
• Cold Brew Coffee Guide: Understanding Coffee Choice, Flavor, and Brewing 

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Our Philosophy: Design Before Brewing

Before we decide how to brew, we decide what the coffee should do.

Cold brew brings out smoothness and sweetness more than sharp acidity. Because the brewing process is slow and gentle, subtle flavors soften while richer notes come forward. For that reason, we choose coffees—and create blends—that still taste full, balanced, and interesting when brewed cold, so the cup feels intentional and satisfying from the first sip to the last.

Consistency comes from architecture, not adjustment.

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Coffee Selection: Single Origins and Blends at Evolution

At Evolution Coffee Roasters, cold brew always begins with coffee chosen specifically for cold extraction—not repurposed from hot‑brew profiles. Our offerings include both single‑origin coffees and intentionally designed blends, each serving a distinct role depending on the experience we want to deliver.

You can explore our current coffee offerings at: https://evolutioncoffeeroasters.com/products 

Tab: “THE COLD BREW COLLECTION”

Rather than treating all coffees as interchangeable, we select them based on how they behave when they brew cold.

Single‑Origin Offering Coffees

Single‑origin coffees—such as those from Peru, Brazil, Colombia, Ethiopia, Bali Blue Moon, or Sumatra—are selected and roasted to highlight clarity, sweetness, and structure. In cold brew, single origins are best used when the goal is exploration and focus.

Typical characteristics of single‑origin cold brews:

• Clear sweetness and defined flavor identity
• Greater sensitivity to grind size and steep time
• A more precise, but less forgiving, extraction window

For cold brew, we most often favor medium‑roasted single origins with:

• Natural or honey processing when sweetness and body are needed
• Washed processing when clarity and a clean finish are the priority

Single‑origin cold brews work best when brewed carefully and consumed relatively fresh, where their character can be appreciated without heavy dilution.

Blends Offering Coffees

For most of our cold brew—especially Ready‑to‑Drink Cold Brew—we rely on blends. Blends provide balance, consistency, and resilience over ice and storage.

A typical Evolution cold brew blend is designed intentionally:

• Brazil natural as the sweetness and body anchor
• Peru or Colombia washed for structure and a clean finish
• A controlled percentage of an aromatic component (such as an Ethiopia natural, Sumatra, or Bali Blue Moon) for lift

Blend characteristics in cold brew:

• Immediate sweetness and approachability
• Greater stability with ice and time
• Layered flavor progression rather than a single dominant note

This approach allows us to create cold brews that are expressive yet controlled.

How We Choose Between Them

When designing cold brew:

• We use single origins for focused, exploratory cups
• We use blends for reliability, balance, and daily drinkability

Neither is better—the choice depends on the experience the cold brew is meant to deliver.

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The “OMG” Blends: Our Reference Ready‑to‑Drink Cold Brew

From these principles, one blend has emerged as our reference point for daily, black cold brew.

Blend composition:

• Brazil Natural, Medium Roast
• Peru or Colombia, Washed, Medium Roast
• Blue Moon / Ethiopia Natural / Sumatra), Medium Roast

Brazil provides chocolatey sweetness and body. Peru or Colombia defines structure and keeps the finish clean. Blue Moon adds an aromatic lift—blueberry or wine‑skin notes that show up after the sip, not before it.

👉 This blend is expressive but controlled, designed to be enjoyed black, with just two or three ice cubes, without becoming thin or sharp.

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The “OMG” Blends as Cold Brew Concentrate

The same blend can also be used as a concentrate—when treated intentionally.

Our goal with the concentrate expression of the “OMG” blend is not raw intensity, but balance under dilution.

In concentrate form:

• Brazil continues to anchor sweetness and body
• Peru or Colombia preserves structure and prevents heaviness
• Blue Moon becomes primarily aromatic, showing more on the exhale than the sip

Rather than reformulating the blend, we protect its balance by adjusting ratio and time, ensuring the concentrate remains expressive without becoming sharp, hollow, or aggressive once served.

👉This allows one blend to create multiple experiences without compromising identity.

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Controlled Extraction Baselines

Before refinement, we establish stable baselines. These values are chosen to support sweetness, clarity, and consistency over time.

📍 As with any coffee, small adjustments may be necessary as origins, crop years, and roast development change.

Ready‑to‑Drink Cold Brew (Black, Light Ice)

• Grind size: Medium‑coarse
  (Think coarse raw sugar or coarse kosher salt)
• Ratio: 1 : 7.5 (coffee : water)
  Example: 120 g coffee → 900 g filtered water
• Steep time: 13–14 hours at room temperature

👉This strength preserves flavor after ice and keeps aromatics alive.

Cold Brew Concentrate

• Grind size: Same medium‑coarse consistency
• Ratio: 1 : 4
  Example: 120 g coffee → 480 g water
• Steep time: 16–20 hours at room temperature

👉 Always diluted before drinking.

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Which One Should You Choose?

If you drink cold brew black with minimal ice, start with the Ready‑to‑Drink approach.

If you plan to dilute with water, milk, or ice, the concentrate offers flexibility.

Both rely on the same fundamentals—the use case defines the method.

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Grind Precision and What “Medium‑Coarse” Really Means

For cold brew, grind size sets the foundation for everything that follows.

A proper cold brew grind should look and feel like:

• Coarse raw sugar or coarse kosher salt
• Larger than drip coffee grounds
• Finer and more uniform than classic French press
• Free of dust or powder

Tip: If rubbed between your fingers, the grounds should feel distinctly granular.

How this compares to other brew methods:

• Finer than French press
• Coarser than drip
• Much coarser than espresso

👉 On most burr grinders, this sits just coarser than your usual drip setting, but not as open as a French press grind.

📍Troubleshooting rule: If it tastes dry or bitter, go slightly coarser; if it tastes hollow or weak, strengthen the ratio before extending time.

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Filtration: Cleanliness Equals Freshness

We filter in two stages:

1. Metal mesh
2. Paper filtration (strongly recommended)

Paper filtration:

• Sharpens aromatics
• Keeps the finish clean as ice melts
• Extends freshness to ~48 hours

📍Skipping paper filtration is one of the fastest ways to lose clarity.

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Refinement, Not Reinvention

Once a baseline is set:

• Adjust ratio for strength
• Adjust time slightly for body
• Maintain grind integrity

📍 Avoid changing multiple variables at once. That discipline is what makes cold brew repeatable.

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What This Means for Home Brewers

Professional results don’t require professional equipment—only structured thinking.

Start with:

• Coffee designed for cold brew
• Defined grind, ratio, and steep time
• One change at a time

Cold brew rewards patience and clarity, not improvisation.

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Final Thoughts

Cold brew at Evolution Coffee Roasters isn’t about trends or shortcuts. It’s about designing pleasure under constraint.

✅ When coffee selection, blend design, grind, ratio, and time work together, cold brew becomes predictable in the best way—smooth, expressive, and reliably satisfying.

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Related Cold Brew Guides

• Grinding, Ratios, and Time – How extraction variables shape balance
• Roast Level and Cold Brew – How roast behavior influences long extraction
• Cold Brew Coffee Guide – The complete framework behind great cold brew

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About the Author

This article was written by Walter Mori, Head Roaster at Evolution Coffee a specialty coffee roaster based in Connecticut, focused on small‑batch roasting, ethical sourcing, and education‑driven coffee experiences. Our cold brew process reflects the same philosophy as our roasting: intention first, clarity always. If you have questions about this article or want to talk more about cold brew, feel free to reach out at [email protected] —I’m always happy to connect.