Just like we don't have PGMPs, but we can imagine them. Like we don't have Jump Drives, but we can imagine them.But they don't.
Consider the issues with airline food. Apparently, human taste changes at higher altitudes, even on pressurized aircraft, so they have to amp up the flavor profiles in the dishes, which isn't necessarily good.
We can also imagine great tasting food at higher Tech Levels. As I mention, "some people think it's the sauce."
A combination of different herbs and spices from different worlds, or even synthesized flavorings. A thousand Chefs from a thousand worlds put their ideas into these TV Dinners.
"Show your PCs a good time with the best Traveller meals in the Galaxy! It's not Tech Level-14 until you've tried them all!"