Focaccia is a flat, round Italian bread with a firm crust and a chewy interior. Before it's baked, the bread is brushed with olive oil and sprinkled with salt, chopped fresh rosemary or Pramesan cheese. Sometimes holes are poked into the surface of the dough to give it a dimple texture that holds the toppings. Look for focaccia in the grocery store bakery or deli.
Prepare the artichoke, bell pepper, cucumber and salad dressing sandwich filling a day ahead; cover and refrigerate. Finish assembling the sandwich just before serving.