Mastering Herb Infusions
Infusing herbs into fat, liquid, or sugar is a matter of controlling temperature to draw out essential oils without burning the leaves. Whether using oil, butter, or alcohol, the goal is a gentle, steady heat that coaxes the aroma into the medium before straining the solids away to prevent spoilage.
Freshness determines the clarity of the result.
Ensure all herbs are completely dry after washing; any water left on the leaves will cause the oil to sputter or create a cloudy emulsion that spoils quickly.
- Heavy-bottomed small saucepan
- Fine-mesh sieve
- Cheesecloth
- Glass storage jar
What goes in.
- 1 cupNeutral oil, butter, or vinegar
- 1 bunchFresh firm herbs like rosemary, thyme, or oregano
Avoid the Boil
Keep the medium below 180°F. If the herbs start to fry or turn brown, you have moved past infusion and into flavoring the fat with burnt plant matter.
The method.
Prepare the herbs
Strip leaves from woody stems. If using soft herbs like basil, leave them whole to prevent bruising.
Warm the medium
Place your oil or butter in a saucepan over the lowest possible heat setting. You are looking for a faint shimmer, not bubbles.
Steep
Add the herbs. Let them sit in the warm medium for 20 to 30 minutes. The edges of the leaves will become slightly translucent when the oil has successfully pulled the flavor.
Strain
Pour the mixture through a fine-mesh sieve lined with cheesecloth into a clean glass jar. Press the herbs gently to extract the last drops of infused fat.
Other turns to take.
Cold Infusion
Place herbs in a jar with oil and leave in a cool, dark place for two weeks; ideal for delicate herbs like dill that lose character under heat.
When it doesn't go to plan.
Always remove every piece of plant matter after straining; residual leaves in the final jar will rot and ruin the batch.
When infusing butter, clarify it first to remove the milk solids which burn faster than the herbs.
Store infused oils in the refrigerator if you intend to keep them longer than three days.
The ones that keep coming up.
How do I know if the infusion is strong enough?
Dip a small piece of bread into the oil. If the aroma hits you immediately and the taste matches the raw herb, it is ready.
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