Hashem commands Benei Yisrael to make the purest olive oil for the Menorah in the Mishkan. The Midrash goes on and describes Bnei Yisrael to olive oil.
The way they made olive oil was using an olive press. An olive press is a flat rock with a big round rock that rolls around ontop of the flat rock squeezing the oil out of the olives...
Wishing you all a Blessed Shabbos and a Purim Sameach!!!