a great recipe for this Donerstag day would surely include a healthy Apple, but that isn't easily added to this sandwich. you'll need Bread for certain, and Bacon if you like.
if you are lactose intolerant like me, then eating Cheese won't be very smart, but it's always tasty.
French onion soup is a delicious additive to any meal, but hold the cheese for me.
fried Eggs are great on a sandwich, or hard boil them for a salad.
no decent recipe in my mind is complete without Garlic.
Dill pickles are nice on a sandwich, and so is Dijon mustard.
ultimately, it's all up to you but i'll keep suggesting my favorite ingredients.
i simply love Asparagus, but it's better with a steak and this is about a sandwich mostly.
during this upcoming walk you might want to munch on some Dates, or you could simply walk with a date. hehe...
when you are finished, you might decide to have a desert of Ice cream or Jello, but then you might want to take a run to work off all of those extra calories.