Making Infused Cooking Oils
Infusing oil requires low heat and patience to extract volatile compounds from herbs, spices, or aromatics into a neutral fat. The key is to keep the temperature steady—never exceeding 180°F—to prevent the ingredients from burning or the oil from turning rancid. Once the aromatics have softened and the oil takes on their character, strain the mixture and store it in a cool, dark place to maintain its integrity.
Start with bone-dry ingredients
Moisture is the enemy of shelf-stable oil. If your herbs or aromatics have a drop of water on them, you risk bacterial growth and spoilage.
- Small heavy-bottomed saucepan
- Thermometer
- Fine-mesh sieve
- Cheesecloth
- Sterilized glass jar
What goes in.
- 1 cupneutral oil (grapeseed or refined olive oil)
- 1/4 cupdried rosemary, thyme, or chili flakes
- 2 clovesgarlic, lightly smashed (optional)
The simmer threshold
The oil should never bubble aggressively. Maintain a gentle, barely-there shimmer; if it smells like fried food, you have crossed into cooking the herbs rather than infusing them.
The method.
Prepare your ingredients
Ensure your aromatics are completely dried. If using fresh herbs, pat them with a paper towel and let them sit for an hour to ensure zero surface moisture.
Combine in the pan
Place the oil and your aromatics into a cold, clean saucepan. Set the heat to the lowest possible setting on your stove.
Monitor the heat
Watch the oil closely for 15 to 20 minutes. Use your thermometer to keep the temperature between 150°F and 175°F. Do not walk away.
Strain the oil
Once the aromatics have wilted and the oil smells deeply of the infusion, remove from heat. Line a sieve with cheesecloth and strain the oil into your sterilized glass jar, discarding the solids.
Cool and store
Let the oil reach room temperature before sealing the jar. Store in the refrigerator if you used garlic or fresh produce.
Other turns to take.
Chili Oil
Use dried bird's eye chilies and toasted sesame oil for the base.
Citrus Infusion
Use wide strips of lemon or orange peel, ensuring you remove all bitter white pith.
When it doesn't go to plan.
Always use a neutral-flavored oil if you want the infusion to be the star.
If you infuse with raw garlic or fresh chiles, keep the finished oil in the refrigerator and use it within one week.
Sterilize your storage jar in boiling water for ten minutes before filling.
The ones that keep coming up.
Can I leave the herbs in the oil for storage?
No. Leaving fresh solids in the oil encourages mold and bacteria growth. Always strain them out.
Why does my oil smell burnt?
The oil temperature likely rose too high, too fast. Use a heavier pan next time to distribute the heat more evenly.
How real cooks make it.
No one’s shared their version yet. Be the first to put your kitchen on the map.
Cook this your way?
Share your version — your steps, your story. We’ll feature it right here.
Add your recipe