You can freeze the cooked tart. Reheat for 20 minutes at 200 C / Gas 6.
Parmesan cheese is not truly vegetarian, as it contains animal rennet. To make this dish 100% vegetarian, omit the cheese or find a suitable vegetarian substitute made without animal rennet. In supermarkets look for the 'parmesan style hard cheeses' which are suitable for vegetarians.
Quite expensive but well worth it. A truly delicious tart. Everyone I have shared this with agrees. - 29 Mar 2014