Abstract: Whole (unsliced) fruit or vegetable product is introduced into a chamber wherein an enzyme inactivating environment has been established and which is maintained by a constant flow of a hot dry inert gas. The product is sliced by hot knives into small pieces in the chamber. The sliced fruit or vegetable product is maintained in such environment long enough to completely inactivate the enzymes and then is introduced into a pulper-finisher to macerate the product and separate the puree from the peel and fiber.