Back before it was bought out, Jersey Mikes used to make the best tuna salad sub I’ve ever had. Does anyone remember the recipe? I’ve gotten close once. I think it was chunk light tuna, and way more mayo than seems reasonable. Given its Atlantic City roots, I assume it was Hellmann’s and not Duke’s or Kewpie. Were there any other ingredients?
Something else to consider, a lot of sandwich places use “deli mayo.” it has a much higher fat content than the stuff you can buy at the grocery store. Which, obviously, has a significant effect on flavor and texture.
It can be a key factor when trying to replicate restaurant recipes.
Is deli mayo like kewpie mayo?