Using a clean tea towel, squeeze as much liquid from grated courgettes and onion as possible. Transfer courgettes and onion into a large bowl.
Add sweetcorn, flour, egg and mix well. Add all the spices and Parmesan (if using), and mix well again, until all the ingredients are combined.
Heat small amount of vegetable oil in a large frying pan. Using 1/4 cup mixture per fritter, spoon out the mixture and fry each fritter for about 3-4 minutes on each side, until golden brown.
Mix the yogurt with Sriracha sauce, and serve alongside with fritters.
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