I am not sure what language thokku is in, most likely Telugu, but it refers to any fresh herb/vegetable pounded/ground to a paste with salt, tamarind and jaggery, and reduced in sesame oil. The key ingredients are tamarind, jaggery, and sesame oil. This recipe makes a thokku out of fresh green chilies and is dynamite!
Green Chili Pickle (Mirchi Achar)
This recipe is from our friend Gautam, who dabbles in gardening, cooking, baking, grilling, photography, and on the side, is a neurosurgeon! He grows a bunch of varieties of green chilies including some of the hottest varieties, and like any Indian worth his salt, pickles them. I love this pickle and followed his recipe to make my own from my garden produce, as I was running out of his stock! Eyeballed most of the ingredients.