Hard boil 3 egg.Let it cool and peel the shell out. See Note below to know process of Hard-Boiling.
In a pan add vinegar,sugar,mustard powder,beet slices,beet juice and slow cook until the sugar dissolved.
In a jar place Eggs first ,pour this mixture.Add the beet slices on top. Leave it for a minimum of 6 hour at Room-temperature. After 6 hour,take the eggs out of the liquid.
Cut all eggs into halves. Take the egg yolk of all eggs carefully and mix with cream, kasundi,chopped onion, chopped green chili in a bowl.Mix well to get a creamy mixture.Adjust salt.
Pour this mixture again with a piping bag or simply using a spoon to put into the egg white halves. Serve with pickled beet slices.