Vision: Eating raisins means conflicts with a neighbor; it is also a warning about how you spend your money. Looking at stale raisins: forgotten things from the past burden your mind. Seeing raisins in a cake: very favorable opportunities are waiting for you. Picking raisins out of a cake: you will have to face a side of life that is not very comfortable.
Depth Psychology: Raisins (and dried fruit): something from the past, something you have lost, or something that has died is coming up again. Maybe you only want the raisins, not the rest of the cake—thereby avoiding unpleasant experiences?