Chef John's Dutch Babies

Preheat the oven to 425 degrees F (220 degrees C).

Blend eggs, milk, flour, vanilla, and salt together in a blender until batter is smooth.

Melt clarified butter in a 10-inch cast iron skillet over high heat until bubbling; pour batter into the center of the skillet.

Bake in the preheated oven until puffed and golden, 20 to 25 minutes. Brush with 1 tablespoon butter, drizzle lemon juice over the top, and dust with confectioners' sugar.