“Portnoy’s Complaint” had the liver; “American Pie” had the pie. Is there anything sacred left in the kitchen? With Chris and Paul Weitz now producers, Adam Herz again handling the script and “Pie” veteran J.B. Rogers directing, probably not. So what’s the culinary focus of a series that may be the 21st-century equivalent of “Porky’s”? Nobody’s talking. Among returning cast are Jason Biggs, Shannon Elizabeth, Alyson Hannigan, Chris Klein, Tara Reid and Mena Suvari, who made 1999’s coming-of-age comedy one of the biggest sleepers of the decade. That’s pie in the sky, for sure.