Had 2 decent Asian Veg meals out of JFK in FF to LAX. Imagine be the same idea for LHR. Both were Indian. A Korma and a matar paneer. Both came with a chana salad starter and galub jamun, which was good. Overall the daal, rice, paneer etc were on par with a good frozen meal. Still though it worked for me.

Had an Asian Veg on same route the other direction and it was an absolute joke.. some fruit & rice and that was it.