Eggs must be absolutely healthy shells and not too fresh - eggs a few days to peel more easily. Put them in a saucepan, cover completely with cold water and bring to a boil. Reduce heat and simmer for 15 minutes. Cool immediately in cold water. Peel, for easier starting from the thicker end, where are hollow. Peeling under water is usually easier. Eggs are placed in a jar, not stuffed, leaving room for the marinade. Other products, without onion, put to boil for 1 minute, then pour over the eggs. Top put chopped onion. The jar was sealed and placed in the refrigerator. It is important marinade to cover eggs completely. The jar was kept in a refrigerator until the eggs are marinated for at least 12 hours. Stored in a refrigerator.