I thought Vanilla was a New World plant?..................
Yes, and I vote for this:
A call for caution in the analysis of lipids and other small biomolecules from archaeological contexts
Organic Residue Analysis (ORA) of lipids is widely used in archaeological science.
• Common misconceptions and pitfalls in applying of ORA are discussed.
• Issues discussed include the incorrect use of biomarkers and analytical techniques.
• Best practice advice is offered to ensure high quality of studies using ORA.
https://www.sciencedirect.com/science/article/abs/pii/S0305440321000674