What is the fine-grained topic of the following text: Recipe : It is a blend of various fragrant spices, which are roasted and then ground for use in various kind of Raita (finely chopped salad vegetables mixed with beaten natural yoghurt), Dahi Vada / Bhalla (fried lentil dumplings, soaked in water and mixed in natural yoghurt dressed with ginger shreds and tamarind sweat Chutney). Only return the topic.
Preparation of a Spice Blend for Raita and Dahi Vada / Bhalla