This is the 5411th most frequent Russian word.
пастилу
A traditional Russian fruit confectionery similar to fruit leather.
The word 'пастилу' is in accusative case to indicate the direct object of the sentence, meaning the pastila that was bought.
Я купил пастилу в магазине.
I bought pastila at the store.
The word 'пастилу' is in accusative case, used as the object of the action of 'готовит', showing what is prepared.
Моя бабушка часто готовит пастилу дома.
My grandmother often makes pastila at home.
The word 'пастилу' is in accusative case because it is the direct object of the action 'ем', stating what is being eaten.