I ran across this interesting tidbit about sesame oil and had to do a little more digging:
The Repository of Arts, Literature, Fashions, Manufactures, &c, March 1816
In the wild, sesamum is prominent in Africa and a bit in India. However, its one of the oldest domesticated oilseed crops known to history.
The colonists were indeed known to plant this crop. This letter to the editor from 1823 gives a fascinating account of a case in Georgetown:
Here is an 1806 of American processing of sesame oil:
The Medical Repository (And Review Of American Publications On Medicine …
While not a common household item in the UK in the Regency era, adventurous households may have indeed stored sesame oil as a shelf stable alternative to butter for cooking.