Would you still want large portions in one go or could you add in more healthy snacks so that you don't want so much to eat at a meal time?
Maybe introduce a healthy soup before a main meal for the same reason.
Go for lean cuts of meat and bulk up with veg, learn to stop when you are full.
Try adapting recipes you like to lower fat versions - curries and Mexican food can be loaded with fat so how it is cooked is important - maybe bulk up with beans and pulses or rice and salad in Mexican and cut down on things like cheese and meat.
When my gallbladder went infected I went on a low fat diet and was horrified checking labels in the shop and realising how much fat was in everything, especially things like cheese and ready meals (I know you don't eat the latter but similar with curries etc...). It helped me make better choices and after a while I didn't want to eat fattier stuff or larger portions, I've slipped a bit since the op but suffer for it and, to be honest, I still don't want a lot of the stuff I ate before.
I lost a load of weight, about 2 and a half stone, quite quickly too. Put some back on, partly due to lack of mobility and steroids, but the thought of eating some things now or large portions just makes me feel sick.