Thanks for the inspiration Murphy, I did something similar but without onions and with some chilli flakes. I wasn’t aware a can of chopped tomatoes was only 47 calories.
I’m a big bloke and a whole can was quite a lot, think I could get away with half a can next time but it def fills you up.
Think I’ll be experimenting with the tomatoes a bit more, perhaps adding other flavours like chilli con carni mix.