Which Soviet-era cake sets a whipped agar-agar souffle between thin cake layers beneath a dark chocolate glaze?

• A Kiev cake
• B Muraveinik
• C Smetannik
• D Ptichye moloko ✓

Developed in 1978 by Vladimir Guralnik and his team at Moscow's Praga restaurant, it relies on agar-agar rather than gelatine because agar still sets after being whipped with sugar syrup boiled to around 117C, which would destroy gelatine.