I’m fairly certain the person who made the tweet was joking and this is actually spiegeleierkuchen (fried egg cake)! The “egg white” is a thick frosting made from yogurt/milk and cornstarch, while the “yolks” are tangerine halves. Here’s a recipe: https://www.sprinklebakes.com/2015/04/german-fried-egg-cake-spiegeleierkuchen.html?m=1
Fun to look at the notes and figure who has and who has not seen the explanation
I was still worried because those are definitely not tangerines, but then I looked at the recipe in the link and it turns out they are actually apricot halves. I feel much better now.
(Source: catchymemes, via lurkerviolin)