The three poems that Leti's "secret admirer" sends her are "To His Coy Mistress" by Andrew Marvell, "Her Face, Her Tongue, Her Wit" by Arthur Gorges, and "To the Virgins, to Make Much of Time" by Robert Herrick. The last note is from Titania's speech in Act III, Scene 1 of Shakespeare's "A Midsummer Night's Dream."
The trivia item below may give away important plot points.
The plot of this movie is a Hispanic version of "Eat, Drink, Man, Woman" (Eat Drink Man Woman (1994)), about an aging widower chef who raised 3 daughters alone, both being written by Ang Lee. Even the opening crisis, the restaurant previously run by the chef has ruined the main feature of a huge banquet and he is called in to save the day, is the same.