Acquiring a taste

You know, I never have understood this 'acquiring a taste' business. I know that these Amazons and Flipkarts seem to be selling anything and, in festive times, selling at a discount so enthusiastically that they deluge you with messages all day long. But can you place on order for, say, 'a taste for Sushi', say? How does one go about acquiring a taste for something which the cognoscenti choose to