In the medium bowl, whisk together the flour and the salt. In the small bowl, whisk together the eggs and milk until frothy. Gradually whisk into the flour mixture, just until blended. Do not over beat.
In the skillet, melt the butter over medium heat. Add the apple slices and brown sugar, and saute until the apple is tender, about 3 to 5 minutes. Stir in the cinnamon and nutmeg.
Pour the batter over the apples and put the pan in the preheated oven. Bake until puffy and brown on the edges, about 10 to 15 minutes.
Remove from the oven. Place and serving platter over the skillet, and quickly invert pancake onto the platter. You may also serve the pancake directly from the skillet.
Squeeze the lemon juice on top. Dust with confectioners sugar. Slice and serve immediately.