In a bowl mix flour with baking soda. Add 1/2 cup curd and mix .Add little more curd and make a smooth batter with no lump.You may not need the whole 1 cup curd to make the batter.Cover it and let it ferment for 8 to 12 hour at room temperature.
To make sugar syrup boil sugar,water at medium flame till you get a string consistency.You don’t need a very thick syrup.So it will take 7 to 10 minute.Add rose water once it’s done.
After fermentation mix the batter well again. You can add food color at this point if you like ,i really don’t prefer. Rather i add a pinch of turmeric which give a nice color.
Take a pipping bag ,pour few spoons of batter .Cut the tip to make a small opening.
Heat oil .To check temperature of oil ,drop a little batter & it will immediately come up. So you can start making your jalebi at medium flame.
Squeeze the batter and make spirals .Reduce the flame a bit. Fry both side till they change color and crispy. Keep them on kitchen paper.
Soak them in warm sugar syrup immediately for a minute or two , take them out into a plate.