A method for debittering olives is described. The method includes contacting olive flesh with a granular polymeric resin under conditions sufficient to remove one or more bittering compounds from the olive flesh, thereby debittering olives.

A method for crystallizing aqueous carbohydrate-containing substances, comprising: purifying the aqueous substance containing carbohydrates; mixing said aqueous substance with a water-absorbing medium; distributing the above mixture in a layer on a high temperature resistant container; heating the mixture layer of the previous step in a microwave apparatus; cooling the mixture layer; re-heating and cooling the mixture layer until it reaches a humidity of 2 to 4%; spraying the crystallized mixture-layer, removing the water-absorbing medium from the crystals obtained; and recovering said crystals. A crystallized or granular product obtained by such a crystallization method.