Based on the search results, there is no clear answer to what Michael Chiarello ate. The search results mainly discuss his death and his restaurants. However, one search result mentions the food that the author ordered at Bottega, which is one of Michael Chiarellos restaurants. The author ordered Chiarellos Smoked & Braised Short Ribs, which were very tender, and Rigatoni alla Cacciatora, which had tomato-braised Sonoma rabbit, olives, pancetta, and pecorino pepato. The author also mentioned that pasta is always a win at Bottega.