Actually that's out of date. JAR-OPS 1`does not exist any more; it's EU OPS 1 now and here's the relevant bit.
OPS 1.510
Landing — Destination And Alternate Aerodromes
(a) An operator shall ensure that the landing mass of the aeroplane determined in accordance with OPS 1.475 (a) does not
exceed the maximum landing mass specified for the altitude and the ambient temperature expected for the estimated
time of landing at the destination and alternate aerodrome.
(b) For instrument approaches with a missed approach gradient greater than 2,5 % an operator shall verify that the
expected landing mass of the aeroplane allows a missed approach with a climb gradient equal to or greater than the
applicable missed approach gradient in the one-engine inoperative missed approach configuration and speed (see applicable
requirements on certification of large aeroplanes). The use of an alternative method must be approved by the
Authority.
(c) For instrument approaches with decision heights below 200 ft, an operator must verify that the expected landing mass
of the aeroplane allows a missed approach gradient of climb, with the critical engine failed and with the speed and configuration
used for go-around of at least 2,5 %, or the published gradient, whichever is the greater (see CS AWO 243).
The use of an alternative method must be approved by the Authority