Bulgarians drink it all year round, but especially in summer — with banitsa for breakfast or with "кебапчета"
(grilled minced-meat rolls) for lunch. You can buy it ready-made in a bottle or make it yourself: just whisk yoghurt with cold water. Another traditional drink is "боза"
— thick, sweet and sour at the same time. To order: "Един айрян, моля."
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Ayran
"Айрян"
is a cold drink made of yoghurt, water and a pinch of salt.

Sharon Hahn Darlin · CC BY 2.0 · Source
History of Bulgaria
An illustrated history of Bulgaria
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Shake for yes?
Traditionally, Bulgarians shake their head from side to side to mean "да"
(yes) and nod to mean "не"
(no).

borzo · CC BY-SA 3.0 · Source
Banitsa
"Баница"
is thin layered pastry baked with eggs and "сирене"
(white brined cheese).

Popo le Chien · CC0 · Source
Shopska salad
"Шопска салата"
— tomatoes, cucumbers, peppers and onion under a snowy mountain of grated "сирене"
— is the unofficial national dish.