Chrysocolla is a honey and flaxseed confection, mentioned by Athenaeus (The Deipnosophists 3:75 (111a)). This version uses hazelnuts as binding material and a great flavor enhancer.
For a more authentic taste use Extra Virgin Olive Oil from Greece, especially Crete. Just like wines, olive oil taste varies based on the variety of olives used and the region where they were grown. The Romans imported the majority of their olive oil from Greece, which was considered to be of the highest quality. A few different brands of Greek olive oil can be purchased in Whole Foods Supermarkets throughout the US.