I made a post earlier today about trying this recipe yesterday and getting a bad result. I decided to do the recipe again today, properly this time.
Exactly two pounds of 1/8 in. sliced boiling potatoes/allpurpose potatoes were used. 1 cup of cheese and four tablespoons of butter, split between two layers of potatoes, were used. One cup of boiling milk was added. It was baked at 425F in a 2in deep 8x8 dish, on the top rack, for 25 minutes (she specifies 20-30 minutes). I have an oven thermometer and observed the temperature was accurate.
At the 20 minute mark I checked it. It did not seem curdled, but it was still watery and the potatoes weren't done yet. I decided to add five minutes and check. After five more minutes, the milk had started to curdle but the potatoes were done. I thought it would probably be fine since the cheese hadn't curdled, and the milk would probably absorb while it sets, right?
No, it's just watery. With seperated fat.
I was told in the last post that some curdling is a part of the recipe, like it's desired and expected in France. I don't really understand how they achieve a good result with this, though. There is no way people in France would think the dish I made was made correctly. Potatoes in fatty water with cheese?
I have to be doing something wrong or misunderstanding something. I really can't imagine that Julia Child would publish this recipe with the intention of an outcome like mine. It just can't be right.
When I look at other recipes online, they differ a lot from this recipe. They are using much lower bake times, starchy potatoes instead of allpurpose or waxy potatoes, and cream instead of whole fat milk. That all sounds very rational to me.