You can make the tuna salad ahead of time, and keep it covered in the fridge for up to 3 - 4 days. Then, when you are ready to enjoy the wrap, you can assemble it and pan-fry it as instructed in the recipe. (Please note: making the tuna salad ahead of time will reduce the length of time you can store the leftover wrap. For example, if the tuna salad is 2 days old when you used it for the wrap, any leftover wrap can be kept for an additional 1 - 2 days, rather than 3 - 4 days.)