DNA- Gingelly oil is sesame oil. You should be able to get it quite easily at asian grocery stores.

Watch out though, because sometimes you'll get a mix of sesame and soy oil packaged as 'sesame oil'. That'll usually have something like 90% sesame oil, and 10% soy oil. The mixed stuff is nice enough with a stir fry, but really horrible in south indian food.

Read the labels, and get yourself something unmixed, and it'll work fine. Also, if you're in Zurich, I'm pretty sure I saw some gingelly - labelled as such- in the Sri Lankan stores around Josefstr.