Place chicken breasts in slowcooker and cover with onions.

Whisk together honey, soy sauce, sherry, garlic cloves, sesame oil, oyster sauce and sambel oelek.

Pour over chicken & onions, stirring to ensure all of chicken coated.

Cover slowcooker and cook on low for 1.5-2 hours.

Remove chicken, cover and set aside.

Pour remaining liquid into saucepan. Bring to a boil and drop heat to a simmer. Cook for about 10 minutes to reduce slightly.

Shred chicken with a fork or your fingers. Place in a bowl and pour liquid over chicken stirring to combine.

Serve with buns.