As i understand it, I can cook the base (meat/fish mixture) then what do i do?:
freeze that and when I need it I first defrost it, then top it with mashed potatoes and cook in the oven
OR
make the topping, cook it all then freeze the lot? if I choose this option how do i use them: first defrost then heat in the oven thouroughly or put in the oven straight from frozen? and for how long?
oh, it's all so confusing!!