The Food Network this week starts a summertime series called The Best Thing I Ever Ate, in which network personalities give screen time to sundry food meccas. In coming weeks (9:30 p.m. Tuesdays), Aaron McCargo Jr. will extol the virtues of Panzarotti Pizza King in Camden; Bolete in Bethlehem, Pa.; the Jug Handle Inn in Cinnaminson; and Yellow Submarine in Maple Shade. Marc Summers will delve into mini-doughnuts at Old City's Buddakan and the pizza at North Philly's Osteria.