A method to determine the roasting recipe R blend for roasting a customised blend of coffee beans C A, C B,... introduced in a chamber of a roasting apparatus, said method being executed by the processing unit of said roasting apparatus, said recipe R blend providing the temperature T @t1, T @t2,... to be applied at discrete successive times t 1, t 2,..., respectively, said method comprising the steps of: - obtaining for each type of coffee beans C n comprised in said blend at least:. the type C n of said type of coffee beans, and. the quantity m n of said type of coffee beans C n introduced in the chamber, and - based on the obtained type C n, getting access at least to:. roasting recipes RM A, RM B,... of the different types of coffee beans C A, C B,... respectively, each recipe R M n being adapted to the roasting of one pre-determined quantity M n of beans of same type C n and providing the temperatures T M n @ti to be applied at discrete successive times t i respectively, and. temperature adaptation factors K A, K B,... of said different types of coffee beans C A, C B,... respectively of the customised blend, and - based on the obtained quantities m n of the different coffee beans C n and the accessible roasting recipes R M n and temperature factors K n, determining the roasting recipe R blend to be applied to said customised blend of coffee beans introduced inside the chamber. said method being executed by the processing unit of said roasting apparatus, said recipe R blend providing the temperature T @t1, T @t2,... to be applied at discrete successive times t 1, t 2,..., respectively, said method comprising the steps of: - obtaining for each type of coffee beans C n comprised in said blend at least:. the type C n of said type of coffee beans, and. the quantity m n of said type of coffee beans C n introduced in the chamber, and - based on the obtained type C n, getting access at least to:. roasting recipes RM A, RM B,... of the different types of coffee beans C A, C B,... respectively, each recipe R M n being adapted to the roasting of one pre-determined quantity M n of beans of same type C n and providing the temperatures T M n @ti to be applied at discrete successive times t i respectively, and. temperature adaptation factors K A, K B,... of said different types of coffee beans C A, C B,... respectively of the customised blend, and - based on the obtained quantities m n of the different coffee beans C n and the accessible roasting recipes R M n and temperature factors K n, determining the roasting recipe R blend to be applied to said customised blend of coffee beans introduced inside the chamber. - obtaining for each type of coffee beans C n comprised in said blend at least:. the type C n of said type of coffee beans, and. the quantity m n of said type of coffee beans C n introduced in the chamber, and. the type C n of said type of coffee beans, and. the quantity m n of said type of coffee beans C n introduced in the chamber, - based on the obtained type C n, getting access at least to:. roasting recipes RM A, RM B,... of the different types of coffee beans C A, C B,... respectively, each recipe R M n being adapted to the roasting of one pre-determined quantity M n of beans of same type C n and providing the temperatures T M n @ti to be applied at discrete successive times t i respectively, and. temperature adaptation factors K A, K B,... of said different types of coffee beans C A, C B,... respectively of the customised blend, and. roasting recipes RM A, RM B,... of the different types of coffee beans C A, C B,... respectively, each recipe R M n being adapted to the roasting of one pre-determined quantity M n of beans of same type C n and providing the temperatures T M n @ti to be applied at discrete successive times t i respectively, and. temperature adaptation factors K A, K B,... of said different types of coffee beans C A, C B,... respectively of the customised blend, - based on the obtained quantities m n of the different coffee beans C n and the accessible roasting recipes R M n and temperature factors K n, determining the roasting recipe R blend to be applied to said customised blend of coffee beans introduced inside the chamber.