-
Make the custard for the Pain Perdu but whisk together the milk, heavy cream, eggs, sugar, Armagnac, and vanilla extract until the mixture is completely homogenous.
-
Place the bread in in a deep dish or tray that is just large enough to hold the bread in a single layer and cover with the custard. If your dish is too large the custard won't soak into the bread completely. If you don't have a suitable dish, you can use a sealable plastic bag and press out the excess air. Cover and refrigerate for a day, turning the bread over a few times in between.
-
Preheat the oven to 450 degrees F (230 C). Remove the soaked Pain Perdu from the refrigerator and flip one more time.
-
Mix 1 tablespoon of sugar with 1 tablespoon of flour and sprinkle half the mixture onto the tops of the bread using a small sieve(such as a tea strainer) to ensure the flour gets sprinkled evenly.
-
Add the butter to a cast-iron skillet and heat over medium heat.
-
When the butter has melted and the foaming subsides, add the bread with flour-sprinkled side down.
-
Dust the Pain Perdu with the remaining flour/sugar mixture and fry until it's well browned on one side (about 5 minutes). If your heat is up too high it will burn, so if it looks like it's browning too quickly, turn the heat down.
-
Flip the bread over and put the pan in the oven.
-
Bake for 8-10 minutes. Keep a close eye on it as the sugar will burn easily. You want the surface of your Pain Perdu to be very dark, but not burnt.