Édouard Manet
(1832 - 1883)
 

Chez Tortoni is a painting by the French artist Édouard Manet, painted ca. 1875.  

The painting depicts an unidentified gentleman sitting at a table in the Café Tortoni de Paris while drawing on a sketchpad. A half-empty glass of beer stands on the table.

Chez Tortoni hung in the Isabella Stewart Gardner Museum of Boston, Massachusetts, United States prior to its theft in 1990 and it has not yet been recovered. 
A $10 million reward is offered for the return of Chez Tortoni and the other stolen items.

https://en.wikipedia.org/wiki/Chez_Tortoni

Chez Tortoni
1875
Oil on canvas
26 x 34 cm
Whereabouts unknown since the Isabella Stewart Gardner Museum theft in 1990