Combine the lemon juice, oregano, and garlic in a small bowl. Season with salt and pepper to taste.
Add the tomato, red pepper, green pepper, onion, and olives to a mixing bowl.
Place the cauliflower in a food processor and pulse until very finely chopped and a rice-like consistency is reached. Transfer to the mixing bowl with the vegetables.
Add the dressing to the bowl with the vegetables and mix well to combine. Season the salad with additional salt and pepper if needed. Enjoy!