Hi Kakaka, No, it is not an idiom. If you look at your sentence structure, it follows the common subject--verb--object sequence: "process" is the subject, "produces" is the verb and "teas" naturally follows behind as an object. "of superior flavour and character" is an example of a prepositional phrase: a prepositional phrase begins with a preposition and provides more information about nouns and verbs. In your sentence, the prepositional phrase provides more information about the quality of the teas after the tea leaves have been processed. Another example: The rigour of this meditation course (subject) benefits (verb) people (object) OF ALL AGES (prepositional phrase). The prepositional phrase "of all ages" provides more information about the WHO of the object "people". It would be unnatural to write: "The rigour of this meditation course benefits ALL AGES OF people." The correct structure should be: "The rigour of this meditation course benefits people OF ALL AGES.", following the natural subject--verb--object (+prepositional phrase) sequence. Even if you were to swap the positions of the subject and object: "People of all ages will benefit from the rigour of this meditation course.", it would still be "people of all ages". On the other hand, it is still possible to use "superior flavour and character of teas" in a sentence like this: "The superior flavour and character of teas is preserved after this process." In this case, "The superior favour and character of teas" is a noun phrase — essentially a phrase centering around a noun head (flavour and character), and "of teas" is a post-modifier after the noun head. The natural sequence of a noun phrase is Determiner-- pre-modifier(s) -- noun head -- post-modifier(s). "of teas" is the post-modifier, hence its position at the end. I hope this helps.

"Teas of superior flavor and character" is right. In this kind of structure (noun 1 + of + noun 2), noun 1 is the main one, and noun 2 describes it. So the process produces teas - and those teas have a superior flavor and character. Compare these examples: He was a man of virtue. She was a girl of many talents. He's very clever for a boy of his age. We focus on these words: man, girl, boy. The other phrases are used for description. The version you proposed ("superior flavor and character of teas") is also a correct one, but there is a slight difference in meaning: here it means the process just produces the flavor/character, but the tea was already there. The sentence from the text ("produces teas of superior flavor and character") suggests that the process produces a new kind of tea - and this new kind has superior flavor and character. It's a nuance, really.

It is correct as it stands. The focus is on the tea, so it comes first - then the description of the tea. If you wanted to emphasize superior quality first, you would say: "the superior flavour and character OF THE teas."