“I really enjoy Sukabumi’s style porridge.”
It should be “Sukabumi-style” in that sentence, because “Sukabumi-style” is an adjective that describes the porridge (which is the object). Yes, there’s a hyphen between Sukabumi and style when used together as an adjective.
“Style” is neither the subject nor the object in the above sentence.
“My style of music is modern jazz.” Style is the subject.
“I hate Sukmawati’s style.” Style is the object.
Then one can use the possessive form.
