01 -
Set your oven to 200°C, then pop the dish in for about 20 minutes. Once the top's golden and looks bubbly, it's good to go.
02 -
Put down your last layer of lasagna sheets, cover with the rest of the Mornay sauce, and toss on the remaining 40 grams of grated Emmental cheese.
03 -
Go for a third layer now: more lasagna, most of what's left of the sauce, another 2 ham slices, finish off that raclette. Second layer first: pasta, a third of the leftover sauce, 2 ham slices, more raclette.
04 -
Start by laying down a sheet of pasta, fit it if you need. Spoon out one fourth of the sauce, add two ham slices, and a chunk of those raclette slices.
05 -
Butter up your big baking dish. Smear a bit of Mornay sauce on the base to keep things from getting stuck.
06 -
Drop 100 grams of that grated Emmental into your sauce. Let it cook another minute at 90°C, speed 4, till it's nicely melted in.
07 -
Toss in the butter, flour, milk, egg yolk, some salt, nutmeg, and pepper into your blender. Cook it for 8 minutes at 90°C, speed 4, until you get a thick, smooth mix.
08 -
Take your quartered, peeled onion and blitz it in a food processor for just 2 seconds on speed 5. Scrape any bits from the sides with a spatula to keep things even.