I first came across it on holiday, where it was a buffet staple. Basically macaroni cheese, only with eggs and baked in the oven.
Delish, and great for a buffet, since it slices into squares.
I’ve just put one in the oven, since dd and family arriving later for early dinner - SiL is craving a roast so doing his favourite lamb, but dd and Gdd1 are largely veggie.
Macaroni pie and a big crumble now both in the oven - and I’m still I’m my dressing gown! Once showered and dressed I will get on with peeling a mountain of potatoes - 2 elder Gdcs are eating like horses and growing like weeds at the moment.
Passports not in the drawer I always keep them in. Turning the place upside down.