In a large mixing bowl, add in eggs, milk, flour, sugar, and salt. Stir to mix everything. The batter will be thin and slightly lumpy
Preheat oven to 400 F. Coat the 10-inch pie dish with the melted butter (both bottom and sides). Pour in the batter into the dish. Bake for 20 minutes (about 30 minutes on my oven) or until set and the crust is browned. If you use a cast iron, you need to bake it longer (for my case it does take me longer). DO NOT open the oven door while baking. You can peek through the glass on the oven door and see the sides of the pancake is puffing and rising up as it is baking
Cooking the apples:
In a large mixing bowl, toss to mix the apple slices with cinnamon, sugar, and nutmeg powder. In a large skillet, melt the butter and add in lemon juice and lemon rind. Let it cook until bubbly. Add in the apple mixture and saute until the apple is tender, about 5 minute (or longer if you like it much tender)
Pancake + apples:
Spoon the sauteed apple mixture into the middle of the pancake and serve immediately