His first name was Mohammed but everyone who knew the lanky African with the irrepressible smile called him Mo. The nickname fit the man who seemed more a whirlwind of energy or a beam of fierce light than a serious grown-up. Three blocks away from the flat he shared with his girlfriend, Katherine, Mo was tossing pasta in a large silver pan, over a high flame in the open kitchen of Tomato. The second syllable of the brightly lit bistro’s name was pronounced mah. When describing diners’ reaction to the fare in its ads, the Market Street restaurant played on the pronunciation. Ahhhh.