The fruit is clearly symbolical of consciousness. It is the fruit of the tree of the knowledge of good and evil, which means that it brings awareness of the opposites, the specific feature of consciousness.
Edinger establishes the canonical depth-psychological reading: the Forbidden Fruit symbolizes the birth of consciousness as differentiation of opposites, making the Fall the mythic prototype of ego-formation and the ‘original sin’ the necessary price of self-awareness.
, Ego and Archetype: Individuation and the Religious Function of the Psyche, 1972thesis