Gran5up, I'm making it today. I'll add lemon zest to the base too, and cut down on the sugar with a view to grans here saying it's too sweet.
Jalima I may have cracked the crumb problem I broke up sliced bread and put it in a tin dish to get hard then I put the rusks into my whizzer with the milk , yolks, butter, sugar, zest, and vanilla. It's not real vanilla pods but was expensive liquid so I guess it will be okay.
Jang, when you suggested making it with semolina, I think that is what I ate long ago. I think the school cook made it. What consistency of cooked semolina is right for the recipe, do you know?