When you dream onions means: The dreaming of onion relates to situations that have multiple layers. Ancient Egyptians linked the onion to eternity because it had a round shape that allowed for different processes or stages to reach the core. To understand the root issue, you will have to traverse these layers. A red onion is a symbol of passion and anger. Dreaming of spring onions or chive can signify new growth in your life.
(in Dream Dictionary)