The DH declared this as being the closest to my old recipe (long lost) and I honestly think it would have been if I hadn't mucked it up a bit (didn't really get the egg whites incorporated properly). I did only use the zest of 1 lemon and the 3 lemons gave me a cup of juice (1 lemon gave me half a cup). Baked for 45 minutes at 160C fan forced oven.
This is one of those forms-a-3/4"-cake-layer-on-top puddings. It had to cool down to thicken up the lower pudding layer and after 3-4 hours the meringue was weeping. Or, it's quite possible I screwed something up. At any rate this was a lemon lover's delight, I just needed to schedule serving time correctly.