Goal: Set up blend roastables with multiple components and proper proportion tracking.
Prerequisites: You have multiple bean lots in your inventory. You understand roastable basics from our Understanding and Managing Roastables guide.
Understanding Blend Roastables
Blend roastables allow you to create pre-roast blend recipes using multiple bean lots from your inventory. Unlike single-origin roastables that use one bean lot, blend roastables combine several bean lots in specific proportions to create your signature blends.
Example House Blend recipe:
40% Brazil Santos
35% Colombia Supremo
25% Guatemala Antigua
When you create a blend roastable, you'll record each blend component along with its proportionate amount. This recipe becomes the foundation for all future roasts of this blend.
Creating Your First Blend
Navigate to the Roastables page
Click "Create Roastable blend"
Give your blend a descriptive name (following naming best practices from our main guide)
Add each component:
Select the bean lot from your inventory
Enter the percentage for this component
Repeat for each component
Ensure your percentages add up to 100%
Set any default shrinkage values if known
Save your blend roastable
The form to create a new pre-roast blend Roastable
How Blend Inventory Deduction Works
Here's where blend roastables really shine: when you roast a batch of your blend, RoastLog automatically calculates how much to deduct from each component bean lot based on your batch size and recipe percentages.
Example: If you roast 20 kilograms of your House Blend (40% Brazil, 35% Colombia, 25% Guatemala), the system automatically deducts:
8 kilograms from your Brazil Santos inventory (40%)
7 kilograms from your Colombia Supremo inventory (35%)
5 kilograms from your Guatemala Antigua inventory (25%)
This happens seamlessly without any manual calculations on your part. You simply enter your total batch size, and RoastLog handles the component calculations automatically.
Using Bean Lots Across Multiple Roastables
One of the powerful aspects of the roastables system is that you can use the same bean lot in multiple ways simultaneously. Your Brazil Santos bean lot, for example, might be featured as:
"Brazil Santos" (single-origin roastable)
Component in "House Blend"
Component in "Espresso Blend"
Component in "Decaf Blend"
Each roastable tracks its own usage independently, giving you complete visibility into how your green coffee inventory is being utilized across your entire operation. You can see in your reports exactly how much of each bean lot went to single-origin versus blend applications.