IN August, food bloggers and mom bloggers in New York were invited to dine at an underground restaurant in a West Village brownstone run, apparently, by George Duran, the chef who hosts the “Ultimate Cake Off” on TLC.

Sotto Terra, the invitation said, was “an intimate Italian restaurant” where attendees would enjoy a “delicious four-course meal,” Mr. Duran’s “one-of-a-kind sangria,” and learn about food trends from a food industry analyst, Phil Lempert. The invitation continued that upon confirming — for one of five evenings beginning Aug. 23 — bloggers would receive an extra pair of tickets as a prize for readers and that the dinner would include “an unexpected surprise.”

The surprise: rather than being prepared by the chef, the lasagna they were served was Three Meat and Four Cheese Lasagna by Marie Callender’s, a frozen line from ConAgra Foods. Hidden cameras at the dinners, which were orchestrated by the Ketchum public relations unit of the Omnicom Group, captured reactions to the lasagna and to the dessert, Razzleberry Pie, also from Marie Callender’s.

“Our intention was to really have a special evening in a special location with Chef George Duran,” said Stephanie Moritz, senior director of public relations and social media at ConAgra.