Herb-Infused Oil
A refrigerated rosemary or thyme oil for finishing dishes.
Proposed · not yet testedEstimated, including a brief cooling period. Heating here develops flavor; it is not a preservation process.
Ingredients
- 120 mlOlive oilOr the same amount of neutral oil; choose one.
- 6 gFresh rosemaryBase recipe: about 3–4 sprigs; thyme can replace it by weight.
Ingredient quantities scale; oven temperatures and cooking times do not. Keep batter depth and pan crowding consistent. For fractional eggs, beat and weigh.
Method
Prepare the herbs
Use a clean saucepan, strainer, and heat-safe storage container. Rinse the herbs, then dry very thoroughly before adding them to oil to reduce splattering.
Warm gently
Place the oil and herbs in the saucepan over low heat. Warm gently for about 10 minutes until fragrant, with only occasional tiny bubbles; do not fry or brown the herbs. Reduce the heat if the oil starts sizzling vigorously.
Strain and chill promptly
Remove from the heat, let it cool briefly, then strain into a clean heat-safe container. Use immediately or refrigerate promptly. Label the preparation date and a use-by date no later than 4 days afterward.
Use the oil
For rosemary chips, spread plain kettle chips on a tray and warm at 300°F / 150°C for 5–8 minutes. Toss immediately with a light drizzle of oil; start with 1–2 teaspoons per 170 g bag of chips so they stay crisp.
Preparation & notes
- Make one day ahead and refrigerate overnight. For longer storage, freeze promptly in small portions instead of keeping it in the fridge beyond 4 days.
- Treat fresh garlic, fresh herbs, and dried-herb variations as refrigerated, short-storage infusions. Do not apply this warm-infusion method to shelf-stable gifts or pantry bottles.
- The rosemary-chip serving suggestion is optional; chips are not included in the ingredient quantities for the oil batch.
Homemade garlic- or herb-infused oil can support botulism toxin formation. Refrigerate at 40°F / 4°C or below and use within 4 days; discard any remaining refrigerated oil after that.
Heating, straining, or adding an unmeasured splash of lemon or vinegar does not make this recipe shelf-stable. Use a validated acidification process if you need a different storage method.
Do not taste an improperly stored infusion to check safety; botulism toxin cannot reliably be detected by smell, appearance, or taste.
Recipe & safety notes
Original measured draft; not a verified restaurant recipe or kitchen-tested final version.
CDC: homemade garlic and herb oils, four-day limit ↗Oregon State Extension: herbs and vegetables in oil ↗Oregon State Extension: validated garlic and herb oil methods ↗