You can make ahead all steps apart from the eggs going in. Chill until needed. Remove from the fridge 1/2 hour before baking and proceed with baking in oven for 3 minutes and then adding the eggs.
It is tasty but involves a lot of frying, very little baking. It took me an hour, and that does not count the time to wash up the large number of pots and pans. Using vine tomatoes may have improved it but, as they are immediately cooked, may be rather marginal. Of course, good flavoured tomatoes will always help. - 13 Mar 2015