They're called Schweinsöhrchen (pig's ears) in German, or Palmiers (palm leaves) in France, Butterflies in Thailand, these heart-shaped pastries are very popular. They often are dipped in chocolate, these are dipped in milk chocolate, though most of the time I have seen them, it is dark chocolate that is used (which is a better choice, otherwise it ends up being too sweet), or strewn with powdered sugar.
To make them, one uses a long slab of puff pastry, roll them up on both sides; when they meet in the middle, you slice them off and bake them. Simple and delicious.
