Whisk gram flour, semolina, lemon juice, sugar, salt, and water into a smooth batter.
Step 2 of 5
Stir fruit salt into the batter until bubbly, then pour immediately into a greased steaming tin.
Step 3 of 5
Steam on high heat for 15 minutes until light and spongy.
Step 4 of 5
Heat vegetable oil in a small pan, crackle mustard seeds, sesame seeds, slit green chilies, and curry leaves; add 0.25 cup water and 1 tsp sugar to create a brine.
Step 5 of 5
Pour warm brine over the steamed dhokla, cut into squares, and serve.