Preheat oven to 400 degrees. Add olive oil, cauliflower, red onion, blood orange juice and salt and pepper to the roasting pan. Cook for 10 minutes, remove from oven, stir and return cauliflower to the oven and cook for 7-8 additional minutes
Remove pan from oven and add in yellow pepper. Season with salt and pepper. Season all vegetables with cumin and stir. Return to oven. Cook for additional 7 minutes. Remove from oven, stir vegetables. Return to oven and cook for an additional 5-6 minutes until well-roasted.
Plate the vegetables and add blood oranges amongst the plates. Top with diced cucumber, parsley and blood orange zest. Serve slightly warm or at room temperature.