“Real” Chinese food poll

Since many people argue that foods like beef and brocolli or sweet and sour pork/chicken aren’t “real” Chinese foods, because they were “invented” in the west, what about foods found at restaurants in Hong Kong which use non-Chinese ingredients?  Are those foods real?  In other words, are egg custard tarts (sweet, egg based custard in tartlet shells – very popular at dim sum), Hong Kong style milk tea (strong black tea with condensed/evaporated milk), yeen-yeung (half coffee, half HK style milk tea), etc “real”?