Preheat oven to 425 degrees F (220 degrees C).
Blend milk, flour, eggs, vanilla extract, 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.
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