After school, Bui found herself in pastry kitchens across New York City, including Le Bernardin, Union Square Cafe, Gotham Bar and Grill and Daniel. Eventually she found her way into chocolate and became enamored with the idea of integrating health, science, art and gastronomy under the tutelage of neurologist and chef Miguel Sanchez Romera. Bui says that chocolate fits her personality very well in that it's precise, anal and scientific.

From the now-shuttered Romera restaurant, Bui brought her quest for single-origin, bean-to-bar chocolate to the roughly two-year-old K+M Extravirgin Chocolate founded by chef Thomas Keller and olive oil producer Armando Manni.

One of the things that sets K+M chocolate apart from the masses is the use of Manni's extra-virgin olive oil—one of the most expensive brands available—as the fat in lieu of more conventional cocoa butter. "[The olive oil] boasts the highest levels of antioxidants (phenols) in the marketplace," per the company's website, which marries perfectly with K+M's "partnership with the University of Florence to select only [beans] with the highest antioxidant and flavor potential of the cocoa once in chocolate bar form," thus accomplishing part of Bui's mission for "healthier" chocolate. The olive oil also adds a unique taste and mouthfeel to the finished bar.

When it comes to the beans, they are sourced from Nicaragua, Peru, Madagascar and Ecuador. As depicted in a documentary-style video on K+M's website entitled "The Peruvian Cocoa Search," viewers get a closeup look at some of the company's very remote partner plantations and the farmers and chocolate makers behind them. In the film, Bui shares, "What we look for in a chocolate maker is someone who is responsive to what we need." That translates into people that share the same curiosity as Bui in her quest for the best chocolate. "We are looking for perfection."

For those looking to get their hands on K+M Extravirgin Chocolate, it is available at a number of retailers, including various Dean & Deluca and Neiman Marcus locations, in addition to online. The chocolate is also used in pastry kitchens at restaurants across the country, including SPQR, Dirty Habit and Keller's own Per Se and The French Laundry.

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