In a mixing bowl add semolina curd and salt.add 1/2 cup water. mix all together gently. Cover and keep aside for 20 minutes.semolina absorbed the water so add some water and whisk gently

Now take the mixture divide it into three equal part in a separate bowl. Take orange food colur mix it with 1 tbsp water and add into one part of batter.now add pinch of soda,few drops of lemon juice mix gently.take the Idli mould Grease with little oil. Pour 1 tbsp batter in each mould.take microwave safe bowl add some water keep the mould in the bowl cover and cook in the microwave for 3 minutes.the orange colour idli is ready

Take the other bowl of batter.mix green colur with water and add into this batter.do the same process as do to prepared orange colour idli.

Now take white batter, add soda and lemon juice and repeat the process and cook as same as to prepared above two.now all three colour idli are ready.serve with coconut chutney.