The Serious Eats website recently explained why Abbot's Pizza on Sepulveda Blvd. in Culver City recently changed it's name to Grey Block Pizza -- and spotlighted the "salad pizza" that makes it worth visiting (or re-visiting). Says the site: "The original Abbot's in Venice remains the same, but founding creator Thomas Schiffer severed ties and took ownership of the Culver…