This is the 14947th most frequent German word.
sardischen
"Sardischen" means "Sardinian" (relating to Sardinia).
Here, "sardischen" is an adjective modifying "Spezialitäten" (specialties), indicating that they are related to Sardinia.
Ich mag die sardischen Spezialitäten sehr.
I really like the Sardinian specialties.
In this instance, "sardischen" describes "Landschaften" (landscapes), relating them to the region of Sardinia.
Die sardischen Landschaften sind besonders malerisch.
The Sardinian landscapes are especially picturesque.
Here, "sardischen" is used as an adjective for "Bräuche" (customs), emphasizing the cultural practices specific to Sardinia.