This month, Gastro Obscura is sharing the recipes and stories behind amazing holiday dishes and drinks from around the world in the ongoing series “Home-Cooked Holidays.” Imagine you’re at a German Christmas market. You’ve probably sipped some mulled wine, nibbled on gingerbread, maybe listened to a children’s choir. You’re just starting to settle into the expected ambience of holiday gemütlichkeit when you see an enchanting blue flame dancing atop a cauldron. It beckons you with its flicker and carries the faint aroma of sweetness. As you get closer, you realize…