Olive begins with a vowel sound. Therefore, use an.
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AnonymousCould we write "...which plays a role of an adjective in here...."No, because the specific role which is played is actually mentioned in the sentence. It's not as if adjectives play a lot of different roles and we are only interested in one of them here. 'oil' plays the role of an adjective. ~ 'oil' is a modifier.
AnonymousIt's of course "an" olive salsa.... Thought it refer to the salsa, you use the word oil which plays the role of an adjective in here....Could we write "...which plays a role of an adjective in here...." instead of the definite article before the word "role" as you have written?The role is correct.