Сложно написать письмо, не зная, какие там вопросы и что именно нужно написать о блюде...Но я попробую...?
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Dear (имя получателя),
Thanks for your letter. I'm sorry, I haven't answered you for a long time. I have been busy at my school. I'll try to answer all your questions.
So, you asked about Russian traditional food, right? Blini are almost the same as English pancakes. In Russia they are usually served with butter and sugar. But there also blini with meat, cheese, jam, fruits.You can taste different kinds of it. Blini are very popular, especially on Maslenitsa. As for me, Blini with caviar - the most delicious kind of this food.
Oh, I've got to go! Mum's calling! Write back soon!
Best wishes
(Имя отправителя)
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Как-то тааак????