In the slow cooker
Add all ingredients except the corn flour and 4 Tbsp water for the slurry
Cook on low for 3-4 hours / High for 2 hours, or until the chicken is cooked through
In the meantime, cook up the required amount of rice, following the packet instructions
Once the chicken is cooked take the breasts out and add the corn flour and water slurry to thicken the sauce. You can do it in a pot if you want to speed up the process.
Using two folks, pull apart the chicken breast. Set aside to cool down, although serving it warm is quite nice as well.
Once the sauce has been thickened, add a few spoons of the sauce over the chicken.
To a bowl, in this order addRice, chicken, more sauce, kewpie mayo, then toasted sesame seeds if you are using them.