Thanks lisalisa - I made this last night and it was YUMMMMM!
Took me longer than 5 mins, as my "il cheapo" lasagne from the corner shop needed a longer soak and I had raw spinach so cooked it a bit first with some lime juice and nutmeg. But still only 20 mins and well worth it - me and DP wolfed it down, have yet to test it on DS but have saved him some for tonight.
Oh and I used a jar of ready-made basil & tomato pasta sauce which worked really well, though obv a bit more expensive...