Preparation of Vegetables: Start by slicing all the vegetables into thin strips. Keep them aside.
Seasoning the Steak: Lay out the sirloin steak slices on a flat surface. Sprinkle them with salt and pepper on both sides.
Assembling the Rolls: Place a mix of bell peppers, zucchini, carrot, and onion on each steak slice. Roll the steak around the vegetables and secure it with a toothpick.
Cooking the Vegetables: Heat one tablespoon of olive oil in a large skillet over medium heat. Add garlic and sauté for a minute. Then add the sliced vegetables and cook until they are just soft. Remove them from the skillet and set aside.
Cooking the Steak Rolls: In the same skillet, heat the remaining olive oil. Add the steak rolls. Cook them on all sides until browned and cooked to your desired level of doneness.
Making the Glaze: In a mixing bowl, whisk together balsamic vinegar and brown sugar. Pour this mixture into the skillet with the steak rolls. Simmer until the glaze has thickened, about 2-3 minutes.
Final Touch: Return the vegetables to the skillet and heat everything together for an additional minute.
Serving: Remove toothpicks, garnish with fresh herbs, and serve hot.