I've pre-ordered an Asian vegetarian meal and I simply received the vegetarian omelette on the morning TXL-LHR rotation.
I've also have the ovo-lacto vegetarian meal on the return during breakfast hours in a couple days.
The low-lactose meal that we usually pre-order (my gf is lactose intolerant) has been the soy sauce-less sushi for the past 10 times.