First of all wash and wipe the colocasia leaves well then remove the thick stalk of leaves and keep aside.
Now take handwa dhokla flour in a bowl then add in gram flour, salt, turmeric powder, ajwain, red chilli powder, curd, sugar or jaggery, garlic chilli paste and oil.
Now add in water as per required and make nice batter from it, make sure that consistency of batter should be little thick and can be spread nicely.
Now take a colocasia leaf and apply batter on it then put another leaf on it, again apply batter of this leaf and cover with another leaf, do this with 6-8 leaves.
Now stick both the ends of leaves then roll it tightly, do this from entire batter and leaves and make patra ready this way.
Now put all the patras in a steamer and stem them for 10-12 minutes, after 10-12 minutes check the patra with knife if knife comes out clean then patra is ready or else cook for further few minutes.
Now take out the patra rolls in a plate and let them cool then cut them in round shape and put in a serving plate.
Now heat oil in a tadka pan, when oil gets hot add in mustard seeds and let them slather, now add in sesame seeds and it also slather then add in coconut water along with normal water.
Now add in sugar and cook till sugar melts, now tadka is ready put this onto the round shape patras and garnish with some coriander leaves and fresh coconut, serve the delicious gujarati patra hot and enjoy.