Making Herb Finishing Oils
A good finishing oil provides a brightness that raw herbs lack when applied directly to a hot dish. By locking the chlorophyll into the oil, you create a vibrant emerald condiment that retains the raw vitality of the garden.
Temperature control is your primary variable.
Keep an ice bath ready to stop the cooking immediately; this is the only way to keep the color neon-green instead of khaki.
- Small saucepan
- Blender
- Fine mesh sieve
- Cheesecloth
- Mixing bowl for ice bath
What goes in.
- 2 cupsfresh soft herbs (parsley, basil, or cilantro), packed
- 1 cupneutral oil (grapeseed or high-quality avocado oil)
- to tastekosher salt
The Ice Bath
Dropping blanched herbs into ice water halts the cooking process instantly, preventing the herbs from losing their bright green color to oxidation.
The method.
Blanch the herbs
Boil a small pot of water. Drop the herbs in for exactly 10 seconds. Remove them with a slotted spoon directly into a bowl filled with ice and water.
Dry completely
Press the herbs between layers of paper towels until they are bone dry. Any residual water will prevent the oil from emulsifying correctly and shorten its shelf life.
Blend
Combine the dry herbs and oil in a blender. Pulse until the mixture is a smooth, vibrant green. Avoid running the blender too long, as the friction will heat the oil and dull the color.
Strain
Line a sieve with cheesecloth and set it over a glass jar. Pour the oil through and let it drip naturally. Do not press the solids, or the oil will turn cloudy.
Other turns to take.
Spicy Chili Oil
Add a tablespoon of red pepper flakes to the oil before blending for a heat-forward finish.
Allium Infusion
Blanch 2 tablespoons of chives alongside the herbs for a sharper, onion-like bite.
When it doesn't go to plan.
Use neutral oils like grapeseed; extra virgin olive oil often has a strong flavor that masks the delicate herb notes.
Store in a dark glass bottle in the refrigerator to protect the oil from light, which degrades the color within days.
Use the leftover herb solids as a base for compound butter or as a stirred-in addition to mashed potatoes.
The ones that keep coming up.
How long will this stay green?
If kept in a sealed, dark container in the refrigerator, it will maintain its color for about 5 to 7 days.
Can I use woody herbs like rosemary?
No. Finishing oils work best with soft herbs like parsley, basil, cilantro, or tarragon. Rosemary and thyme remain too tough and do not blend into a smooth oil.
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