It's the hot syrup!!!!!!!!
The name is galaktobureko, here's Wikipedia's definition
Galaktobureko (Greek: γαλακτομπούρεκο) is a Greek dessert of semolina-based custard in phyllo. It may be made in a pan, with phyllo layered on top and underneath, or rolled into individual servings (often approximately 10 cm long). It is served or coated with a clear, sweet syrup. The custard may be flavored with lemon, orange or rose.