An awkward, shy girl named Rosita Amado (Génesis Rodríguez) grew up in the village of Xochilcacahuatel with humble, uncultured relatives who worship Ek Chuah, an ancient idol. When her grandfather Juan Amado (Héctor Suárez), known as "The Chocolate King", dies, she is the only person left who knows the secret Mayan recipe that built his corporate empire.
While Rosita has a curvaceous body, she also has a big nose and buck teeth. She falls madly in love with charming chocolatier Bruce Remington (Carlos Ponce), the handsome heir to a candy factory, Chocolate Supremo. Their lives will interlace when Juan chooses her to take his place and teaches her the secret recipe. Rosita heads to Florida to fulfill her grandfather's last wish, bringing her deaf great-aunt Dulce (Maria Antonieta de las Nieves), her uncle, Diosdado (Ricardo Chavez), and the rest of her extended family with her. (Telemundo publicity referred to them as an "assortment" of "uncouth relatives.")
Meanwhile, Bruce's mother Grace Remington (Kristina Lilley), an unscrupulous and overly ambitious woman (and Juan's stepdaughter) is claiming that the factory is near bankruptcy and ruthlessly plots against Rosita, becoming the young girl's most dedicated enemy. Grace wants the inheritance and the secret recipe and enlists the help of her son's lover Samantha Porter (Karla Monroig) to talk Bruce into seducing Rosita. When Bruce realizes that he truly loves Rosita, his mother has already plotted her downfall. Rosita must confront the Remington and fight for her grandfather's legacy. Meanwhile, Ángel Pérez (Khotan), a brutal, dangerous man from the past, threatens Rosita's fresh start.
Rosita finds romance, deception and betrayal as she searches for true happiness in a new world. She learns about the dangers of hatred, jealousy and vengeance. The heroine finds herself caught between two powerful forces: love and chocolate.
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