Begin by thinly slicing the Roma tomato, mini cucumber, red onion, and roasted red pepper into even pieces, approximately 1/4 inch thick.

Lay two slices of whole wheat bread flat on a clean surface or cutting board and generously spread a layer of your favorite hummus on one slice.

Start layering your sliced red onion, roasted red pepper, cucumber, and tomato on the hummus-covered slice of bread, adding a handful of arugula on top.

Take the second slice of bread and gently place it on top of the vegetable layers. Press down lightly to ensure the sandwich holds together.

Using a sharp knife, cut the sandwich diagonally in half for easy handling and serve immediately.