Back to the sandwich. Spread one side with the dill dip and the other with the avocado.
Lay the slices of cucumbers on the avocado side. This is important, as it helps prevent them from sliding out of the sandwich. On the dip side, put the tomatoes and then the spinach.
Put the remaining ingredients on the sandwich. On mine, I put one cheese on top of the cucumbers and the other on top of the spinach with the onions in between. I think it's just a weird thing of mine, but that's how I always made it at the shop.Ooooo, yums.
**I make my own dill dip for this sandwich. It's fairly simple and yummy. I make it at least a night in advance so the flavors have time to mix together nicely. Mix 1 Cup sour cream with 1/2 Cup mayonnaise. Add in 1T minced onion (dried), 2tsp. dill weed and 1tsp parsley flakes.