Combine the mayo, lemon juice, soy sauce, and sesame oil in a small bowl and mix well.
Roughly chop the crab stick into about ~1 cm chunks (or any size you prefer) then shred using your hands or a fork.
Combine the shredded crab stick and the sauce and mix until fully combined.
Store in an airtight container in the fridge until ready to use. Can be prepared one to two days before making sushi if desired. When using in sushi rolls - use a fork to scoop and place the mixture, leaving excess sauce behind for best results.
Notes
This site has tons of resources and recipes for making sushi at home! If you're new to making sushi be sure to check out the Sushi Beginner's Guide before getting started! This crab salad recipe is lighter on the mayo and heavier on the other flavors (soy, lemon, sesame oil) than many other crab salad recipes. Personally, I strongly prefer it this way. The only downside is that the sauce can be a little bit runny, but I think it's worth it for the improved flavor. When using this in sushi rolls, try to leave excess sauce behind to avoid soaking the nori too much.Check out my Spicy Crab Salad recipe for the spicy version!