The reason a Whopper that you order in Pocatello Idaho tastes **exactly** the same as the one you order in Beijing, is because that "flavor" is manufactured in a chemical factory off the Jersey Turnpike. A factory that produces several well known name brand colognes. The flavor has little to do with the ingredients or the cooking process.
Burger King really embraced the "engineered flavor" thing. Their strawberry milkshake. You'd think it contained milk, ice cream, and strawberries. Nope. This is the chemical list from the artificial strawberry flavor alone.
amyl acetate, amyl butyrate, amyl valerate, anethol, anisyl formate, benzyl acetate, benzyl isobutyrate, butyric acid, cinnamyl isobutyrate, cinnamyl valerate, cognac essential oil, diacetyl, dipropyl ketone, ethyl acetate, ethyl amyl ketone, ethyl butyrate, ethyl cinnamate, ethyl heptanoate, ethyl heptylate, ethyl lactate, ethyl methylphenylglycidate, ethyl nitrate, ethyl propionate, ethyl valerate, heliotropin, hydroxyphenyl-2-butanone (10 percent solution in alcohol), a-ionone, isobutyl anthranilate, isobutyl butyrate, lemon essential oil, maltol, 4-methylacetophenone, methyl anthranilate, methyl benzoate, methyl cinnamate, methyl heptine carbonate, methyl naphthyl ketone, methyl salicylate, mint essential oil, neroli essential oil, nerolin, neryl isobutyrate, orris butter, phenethyl alcohol, rose, rum ether, g-undecalactone, vanillin, and solvent.