This is the 8998th most frequent Turkish word.
tatlıyı
"Tatlıyı" means "the dessert" or "the sweet" in English.
Here, "tatlıyı" refers to the direct object (dessert) being loved and is in the accusative case.
Tatlıyı çok seviyorum.
I love dessert very much.
In this sentence, "tatlıyı" also serves as the direct object, identifying what was prepared, and is in the accusative case.
Misafirler için tatlıyı hazırladım.
I prepared the dessert for the guests.
Here again, "tatlıyı" is the direct object that is being eaten, and appears in the accusative case to specify definiteness.