Cold Brew Coffee: A Complete Guide (Including How to Brew with a Toddy System)
Cold brew coffee has earned its place as more than a seasonal trend. With its smooth body, low acidity, and naturally sweet flavor, it’s become a favorite for coffee lovers who want bold taste without bitterness. But behind every great glass of cold brew is a carefully controlled process—especially when using a professional brewing system like a Toddy.
In this guide, we’ll break down what makes cold brew different, why the Toddy system is so popular, and exactly how to brew a consistently excellent batch at home or in a café.
What Makes Cold Brew Different from Iced Coffee
Cold brew is brewed without heat. Instead of hot water extracting flavors quickly (and aggressively), cold brew relies on time. Coffee grounds are steeped in cold or room-temperature water for many hours, slowly extracting soluble compounds.
This process:
-Reduces acidity by up to 60–70%
-Minimizes bitterness
-Emphasizes chocolate, caramel, and nutty notes
-Creates a versatile coffee concentrate
The result is a coffee that’s smooth, balanced, and incredibly forgiving.
Why Use a Toddy Cold Brew System?
The Toddy Cold Brew System is one of the most trusted tools in both cafés and serious home setups. It’s designed specifically for immersion brewing and produces a clean, sediment-free concentrate.
-Key benefits of the Toddy system:
-Consistent extraction
-Built-in filtration
-Easy scalability
-Long shelf life for concentrate (up to 2 weeks refrigerated)
Coffee Basics for Cold Brew Success
Before we get into the steps, let’s talk fundamentals.
Coffee Bean Choice
Roast level: Medium to dark roasts are most common, but light roasts can work if you like brighter flavors.
Freshness: Coffee should be within 2–4 weeks of roast.
Origin notes: Chocolatey, nutty, and caramel-forward beans shine in cold brew.
Grind Size (This Matters a Lot)
Grind size: Extra coarse (similar to raw sugar or coarse sea salt)
Too fine → over-extraction, bitterness, and clogging
Too coarse → weak, underdeveloped flavor
If you’re using a burr grinder, go near the coarsest setting.
Cold Brew Ratios (Toddy Standard)
The Toddy system brews a concentrate, not a ready-to-drink coffee.
Classic Toddy Ratio
12 oz (340 g) coarsely ground coffee
7 cups (56 oz / ~1.65 L) cold water
This yields approximately:
32–40 oz of cold brew concentrate
Dilution Ratio (After Brewing)
1:1 (equal parts concentrate and water or milk) is most common
Stronger preference: 1:0.75
Lighter preference: 1:1.5
Step-by-Step: How to Make Cold Brew with a Toddy
Step 1: Set Up the Toddy
Insert the rubber stopper into the bottom of the Toddy brewing container.
Place the felt filter inside, making sure it lies flat against the bottom.
Step 2: Add Coffee Grounds
Add 12 oz of coarsely ground coffee to the Toddy.
Gently shake to level the grounds.
Step 3: Add Water in Two Stages
Slowly pour 3.5 cups of cold, filtered water over the grounds.
Let the coffee “bloom” for about 30 seconds.
Add the remaining 3.5 cups of water, pouring in a circular motion to saturate all grounds.
Avoid stirring aggressively—gentle saturation is key.
Step 4: Cover and Steep
Place the lid on the Toddy.
Let steep at room temperature or in the fridge for 12–24 hours.
12–14 hours: lighter, brighter body
18–24 hours: richer, fuller extraction (most popular)
Step 5: Drain the Concentrate
Remove the rubber stopper.
Place the Toddy on top of the glass decanter or carafe.
Let the concentrate drain naturally (about 20 minutes).
Do not press or squeeze the grounds—gravity does the work.
Step 6: Store Properly
Transfer concentrate to an airtight container.
Refrigerate for up to 14 days for best flavor.
Serving Suggestions
Cold brew concentrate is incredibly versatile:
Classic: 1:1 concentrate + water over ice
Creamy: 1:1 concentrate + milk or oat milk
Vanilla Latte: Add vanilla syrup and milk
Cold Brew Tonic: 1:1 concentrate + tonic water + citrus peel
Hot Option: Dilute with hot water for a smooth, low-acid hot coffee
Common Mistakes to Avoid
-Using pre-ground coffee: Too fine, too inconsistent
-Skipping filtration: Leads to muddy flavor
-Over-stirring: Causes bitterness
-Wrong ratios: Too much water dilutes extraction
-Not cleaning your Toddy: Oils build up fast
Final Thoughts
Cold brew is about patience, precision, and simplicity. When brewed correctly—especially with a system like the Toddy—it delivers a consistently smooth, flavorful coffee that works just as well straight over ice as it does in creative drinks.
Whether you’re brewing for yourself, friends, or customers, mastering cold brew is an investment in better coffee—one slow drip at a time.
For directions at home check out our brewing guides available for any type of coffee brewing method.
