Have a ridiculously over indulgent one...... very very simple but a bit of trial and error for your casserole dish..... basically just cooked rice base the about an inch thick, covered with 1-1.5cm thick layer of tuna (drained) which is about 2 big tins for us...... and just topped with a 2cm thick layer of extra cheesy white sauce (Google recipe for it) topped with a layer of cheese and baked for around 20-30 mins until top is golden. Its a guaranteed heartburn worthy recipe but I love it so much and my nana makes it every time I visit (only 3-4 times a year )