I never understood why one would want to make a veggie burger taste like meat. Properly made veggie burgers taste delicious by them selves. Much more flavour than the meat versions.
But those are probably already on the menu and this is an addition to regular vegetarian burgers? Here in Norway we've had vegan burgers from both mcdonalds and burger king and max hamburgare (swedish company) for a couple years that do not taste like meat and especially burger kings' score high on the taste tests [1].
Personally I never eat fast food except a kebab once every two months but we do make vegetarian burgers maybe every other week here at home [2].
[1] https://translate.google.com/translate?sl=no&tl=en&u=https%3...
[2] https://translate.google.com/translate?sl=no&tl=en&u=https%3...