Preserving Herbs in Oil
Preserving herbs in oil is a method of suspending flavor in a stable, usable medium by packing clean, dry herbs tightly into a jar and submerging them completely in neutral oil, effectively shielding them from oxygen to maintain their character for several weeks in the refrigerator.
Moisture is the enemy
The single most important rule is that every leaf must be bone-dry after washing; even a drop of water introduces bacteria that thrive in an oil environment.
- Glass jar with a tight-fitting lid
- Paper towels
- Sharp chef's knife
What goes in.
- 2 cupsfresh soft herbs like parsley, cilantro, or basil
- 1 to 2 cupsneutral oil like grapeseed or high-quality extra virgin olive oil
Avoid surface exposure
Every single leaf must remain beneath the oil line at all times; any herb exposed to the air will darken and spoil within days.
The method.
Wash and dry
Rinse your herbs in cold water. Lay them in a single layer on paper towels and pat them until you are certain there is no lingering dampness.
Prepare the jars
Ensure your glass jar is clean and completely dry. Use a sterilized jar if you intend to keep the oil for more than a week.
Pack the herbs
Gently pack the herbs into the jar. Do not compress them into a solid mass, but fill the jar to about an inch below the rim.
Submerge
Pour the oil over the herbs until they are entirely covered. Use a clean chopstick or skewer to poke down through the leaves, releasing any trapped air bubbles.
Seal and chill
Wipe the rim of the jar clean before tightening the lid. Store the jar immediately in the coldest part of your refrigerator.
When it doesn't go to plan.
Use firm herbs like rosemary or thyme if you want the oil to infuse with their woody aromatics over a longer period.
If using basil, blanch the leaves in boiling water for 10 seconds and shock in ice water before drying to keep the color vibrant.
Label your jar with the date; use the oil within three weeks.
The ones that keep coming up.
Can I leave this on the counter?
No. Herbs contain moisture and low acidity, creating a risk for dangerous bacterial growth if kept at room temperature. Always keep these jars refrigerated.
What happens if the oil turns cloudy?
Most neutral oils will solidify or turn cloudy when refrigerated. This is normal and the oil will return to its liquid state once brought to room temperature.
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