Trim the ends of the zucchini & shred it using the side with the big holes on a box grater.
Finely chop the garlic, green chili, parsley & zest the lemon. The parsley & lemon zest are added to the yoghurt later.
On a medium burner on medium flame, heat oil in a frying pan. Add the mustard seeds and sizzle (approx. 8-10 seconds), taking care not to burn the seeds. Keep in mind that when heated, mustard seeds tend to splatter.
Add the garlic and green chili and sauté just enough to remove the raw smell of garlic, approx. 30 seconds.
Add the shredded zucchini and salt. Mix.
Reduce the flame to low-medium and cook till the zucchini is done (approx 5-6 minutes).
Keep mixing in between. The zucchini will wilt and reduce in size.
Once the zucchini is cooked, switch off the gas and remove from heat. Let it cool down (approx. 5-7 minutes).
Meanwhile, add the yoghurt to a bowl & whisk to make it smooth. Add a little water if the yoghurt is thick to adjust consistency. Homemade yoghurt tends to be watery and may not need additional water. No need to add water if making it as a dip.
Next add the roasted cumin powder, ground white pepper, salt, lemon juice, lemon zest & the chopped parsley to the whisked yoghurt. Mix.
Add the cooled down zucchini to the prepared yoghurt & mix.
Taste & adjust seasoning.
Serve as a side dish or have it as a snack or a dip.