The invention relates to tomato derived compositions that are produced by treating tomato products, such as tomato paste, tomato juice, tomato serum and tomato pulp, with deaminase to convert 5′AMP contained therein into 5′IMP. The taste contribution of these tomato products in end-use applications is substantially improved by this enzyme treatment. The invention also provides a process of preparing a tomato derived composition, said process comprising: providing a starting material containing at least 80% by weight of dry matter of one or more tomato derived products selected from tomato paste, tomato juice, tomato serum, tomato pulp and combinations thereof； and treating the starting material with deaminase to convert at least 30% of the 5′AMP contained therein into 5′IMP
