Preheat the oven to 375*F. Line two baking sheets with foil, if desired. Chop the vegetables.
Put the chopped cauliflower, bell peppers, and onions on the baking sheet and toss with 2 tablespoons of oil.
Roast in a preheated oven for 30 minutes. Stir and roast another 10-15 minutes until done. Let cool.
Meanwhile, make the dressing by stirring together the hummus, lemon juice, one tablespoon of olive oil, water, and garlic.
Add the tomatoes and cucumbers to a bowl. Add the cooled roasted vegetables to the bowl and pour dressing over the veggies. Stir well to completely cover all the veggies. Enjoy!