I use something like this:
https://www.winfieldsoutdoors.co.uk/victorinox-dual-knife-sharpener/?gclid=Cj0KCQiAjMKqBhCgARIsAPDgWlz6g-iuo-ai9AAxl-_0nNjZgnQMUfAhir0NMji5pNsuKg4Jw75gZ6gaAtIDEALw_wcB
Sharpen each serration until burr forms. Remove burr on the other side.
Could use a ceramic or diamond honing rod also.
@Acliff started
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I use something like this:
https://www.winfieldsoutdoors.co.uk/victorinox-dual-knife-sharpener/?gclid=Cj0KCQiAjMKqBhCgARIsAPDgWlz6g-iuo-ai9AAxl-_0nNjZgnQMUfAhir0NMji5pNsuKg4Jw75gZ6gaAtIDEALw_wcB
Sharpen each serration until burr forms.
Remove burr on the other side.
Could use a ceramic or diamond honing rod also.