Identify the job: finishing drizzle (needs aroma), baking/saute (needs fat), or a sauce/dressing (needs stability).
Start with the 1:1 swap if your substitute is another nut oil; if you’re using a neutral oil, reduce the amount slightly to keep the flavor from thinning.
If your recipe relies on hazelnut aroma, choose a toasted-nut option (walnut oil, pistachio oil) or add hazelnut powder to a mild oil.
For browned butter swaps, cool to lukewarm before mixing into dressings so it blends smoothly.
Taste and adjust: add a pinch of salt for nutty oils, or a tiny splash of lemon for dull swaps in vinaigrettes.