Heat the oil in a nonstick skillet over medium heat. Add in the onion and sauté until it softens and slightly caramelizes, about 4 minutes.
Add the onion to a bowl with the beef, Hummus, pepper and salt. Mix until well incorporated, then form into 4 3/4” patties. Using your thumb, make a shallow depression in the centre of each burger.
Place burgers on a grill heated to medium, close the lid and cook on both sides, about 6-8 minutes per side, until they reach an internal temperature of 160 F.
To serve, place the bell peppers on the bottom half of the buns, top with the burger and a tablespoon of Sabra hummus, and garnish with the shredded cabbage. Enjoy!