Questions & Answers about Bu lezzetin bizim yöreye özgü olduğunu biliyoruz.
Why does bizim yöre take the dative suffix to become bizim yöreye?
The postposition özgü means "specific to" or "characteristic of." It always requires the noun or pronoun before it to take the dative case (-(y)a/-(y)e). That is why bizim yöre gets the -ye suffix here.
Could I use has or mahsus instead of özgü in this sentence?
Yes, they mean the same thing and work the exact same way. You could say bizim yöreye has or bizim yöreye mahsus. All three require the dative case. Özgü is a common modern Turkish word, while the other two are older loanwords that are still widely understood and used for exclusivity.
Why is it bu lezzetin with a genitive suffix instead of just bu lezzet?
This is a refresher on how "that" clauses work in Turkish. When you use the -dIk structure (like olduğunu) to say "that something is...", the subject of that subordinate clause must take the genitive case. Because the clause is "that this flavor is...", bu lezzet becomes bu lezzetin (literally "this flavor's").
What is the grammatical breakdown of the suffixes on olduğunu?