Learn Dutch: Deze fles olijfolie is peperduur, maar de kwaliteit is uitstekend. - This bottle of olive oil is extremely expensive, but the quality is excellent.

This is a classic example of the "zero preposition" rule for measure words. In Dutch, when you have a container or a measure (like fles, bottle) followed by the substance it holds (olijfolie, olive oil), you just place them directly next to each other. You do not use van to translate the English "of".

What is the literal meaning of peperduur?

It literally means "pepper expensive". Dutch frequently uses nouns as prefixes to intensify adjectives. Because pepper was historically a very costly spice in the Netherlands, peperduur became the standard, expressive way to say "extremely expensive".

Does the word uitstekend come from a verb?

Yes, it is the present participle of the verb uitsteken, which means "to stick out". If something "sticks out" above all the others, it is "outstanding" or "excellent".

How can I easily remember the gender of kwaliteit?

Any Dutch noun ending in the suffix -iteit (which often translates to "-ity" in English) is always a de word. This is a very consistent rule that also applies to words like universiteit and identiteit.