Are there any restaurants in Israel (or other) that have a hechsher endorsing the preparation and eating of locusts in their restaurants?
I wrote to Dr. Ari Greenspan and R' Dr. Ari Zivotofky, who have hosted "Mesora Dinners," serving foods with interesting Halachic statuses, in various places. As far as they know, there are no kosher restaurants that include locusts on their menus.
When they held the Mesora Dinners in the United States, the menu did not include actual locusts; they just got a shout-out in the form of "chocolate locusts." When they held it in Jerusalem, in The Eucalyptus, which is certified by the Jerusalem Rabbinate, they did serve locusts, which Dr. Greenspan and R' Dr. Zivotofsky provided. R' Dr. Zivotofky said that he thinks Eucalyptus "still sometimes serves them when there is a specific request."