Nut oils can make a world of difference in a salad. Fortunately just a few spoonfuls is all that’s needed to add a lot of flavor. I like hazelnut oil and buy it from a trusted source or brand. (
Leblanc is reliably good, which can be found in well-stocked supermarkets or
online.)
Buy the smallest bottle you can since it doesn’t get better the longer it sits. Store nut oils in the refrigerator and try to use them within 6 to 8 months. If you don’t have nut oil, substitute the same amount of olive oil. Walnuts make a good substitute for the pecans.