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?
This doesn’t directly relate to your Jersey Mikes recipe request, but tuna related - quality of tuna makes a huge difference. Tuna packed in oil is typically higher quality than tuna packed in water. The best canned tuna I’ve found is As Do Mar solid tuna, Italian yellowfin tuna certified caught via pole & line fishing.