Variants:

• ✔ dark brown sugar + golden syrup (original)
• ✔ dark brown sugar + sweetened condensed milk
• light brown sugar + golden syrup
• light brown sugar + sweetened condensed milk
• ✔ light brown sugar + sweetened condensed milk + salt
• half dark half light brown sugar + golden syrup
• half dark half light brown sugar + sweetened condensed milk
• half dark half light brown sugar + sweetened condensed milk + salt

Original:

• strong golden syrup taste

Dark brown sugar + sweetened condensed milk:

• milder, sweeter

Light brown sugar + sweetened condensed milk + salt:

• mild yet poignant