Take semolina add salt, baking powder and curd, make a batter and keep it to rest for 4 hours.

Take idli stand grease with oil and put batter on it, keep it to steam.

When idli is half cooked, take it out, mix red colour in a bowl and yellow colour in another bowl, make design of your choice and keep it to steam again.

When idli is completely cooked, keep it to cool, then take it out.