I topped corn & mayonnaise buns with broccoli, which contains lots of vitamin C. Steps for shaping the dough are included.
If the filling is only mayonnaise and corn, it seems like it's lacking vegetables...so I tried putting broccoli which contains plenty of vitamin C.
If the combined mayonnaise and corn is left for some time, it will get watery. So make sure you mix it right before forming the dough into shapes.
Enjoy Japanese food around the world.