Mix gradually besan, water,salt,fresh lemon juice(1tbsp) and yogurt(2 tbsps) in a bowl slowly without forming lumps .
Keep in aside for 30 mins.
Boil water in your steamer(I used momo steamer )
After 30 mins add baking powder and baking soda to the dhokla mixture and mixed it properly .
Grease the tin where you will make the dhokla (i used 3x7 inch cake tin) and set it in the steamer .
note:After mixting the baking soda and powder set the tin immediately in the steamer.
It will take around 20 to 25 mins (poke with a teeth pick to check whether cooked properly) .
Once cooked, keep it aside to cool down.
Boil 1 cup of water with 2 tbsp sugar and 1 tbsp fresh lemon juice.
Take the dhokla out of the tin and pour the sugar syrup over the dhokla and let it absorb properly
Heat 1 tbsp oil in a pan and splutter some black mustard seeds, curry patta and chillies for garnish.
Notes
After mixting the baking soda and powder set the tin immediately in the steamer.poke with a teeth pick to check whether cooked properly .Demold only after it cools down.