Potatoes Anna

Total time: 80 minutes   60 minutes baking time
     'Pommes Anna' with Sweet Potatoes added... This serve 4 - 6  I didn't peel the potatoes - I like both the appearance and the taste (and it's healthier).  

 Ingredients:

• 1/3 cup butter
• 2 medium white, potatoes, 12oz, 360gr total
• 1 or 2 sweet potatoes, roughly the same size, 12oz, 360gr total
• salt & pepper

 Instructions:

• Clarify butter: melt butter in small pan over low heat just so that it is melted.  You will notice the white milk solids in the butter.  We don't want these.  With a small spoon skim off as much of the floating milk solids as you can. 
• Carefully pour the clear butter into a glass measuring cup leaving behind the remaining solids. 
• Using a basting brush butter the insides of a small glass baking dish (large enough to just hold the potatoes and, preferably, with deep sides) with a little of the butter. 
• Slice the potatoes into paper thin slices, using a mandolin, box slicer, food processor, whatever you have. 
• Line the bottom of the baking dish with white potato, brush very lightly with butter. 
• Add a layer of sweet potato, brush with butter. 
• Repeat layers until you have used all of the potatoes.  If you use salt & pepper put a little on the middle and top layers. In a perfect world your potatoes should reach or almost reach the top of the dish. 
• Cover with foil and bake in 400F (200C) oven for 45 minutes. 
• Uncover and continue baking an additional 15 minutes or until brown on top and knife goes into center easily.  
• Remove and let rest for 5 - 10 minutes.
•   Invert on to a large plate - it should retain it's shape. 
• Slice into wedges and serve.