John Wesley on Numbers 11:8

Fresh oil - Or, of the most excellent oil; or of cakes made with the best oil, the word cakes being easily supplied out of the foregoing member of the verse; or, which is not much differing, like wafers made with honey, as it is said Exo 16:31. The nature and use of Manna is here thus particularly described, to shew the greatness of their sin in despising such excellent food.