This is the 17594th most frequent Russian word.
тунца
"Тунца" means "tuna" (a type of fish) in English.
In this context, 'тунца' refers to the ingredient used in cooking—a type of fish.
Я купил немного тунца для салата.
I bought some tuna for the salad.
Here, 'тунца' is used to specify the main food item prepared during cooking—tuna.
Вчера я приготовил тунца с овощами.
Yesterday I cooked tuna with vegetables.
In this instance, 'тунца' indicates the food item being referred to, emphasizing its preparation style.