Hi Ummmm,
If they like pasta, try making loads of pasta type dishes where flavours are mixed up, rather than dishes with individual portions of things. Bologneise for instance. Cut down the amount of meat and add loads of other things to bulk it up.
Same with rice.
Stir fries are a good idea, a bit of pork or chicken and then cashew nuts mushrooms, bits of this bits of that. Nuts will give them the protein they need as will grated cheese over the top of everything.
I know you are a good cook, so good luck.
Nice to see you back.
Mr LL was a huge meat eater but I have cut it down probably by 75%