Preheat the oven: Set the oven to 200 ℃.
Prep the butternut and beetroot: Peel and cut into chunks. Place the butternut on a baking tray, drizzle with oil, season with salt, and toss to coat. Roast for 20 to 30 minutes. Repeat the same process with the beetroot.
Roast the Brussels sprouts: Place them on a baking tray or dish, drizzle with oil, rub with butter, and season with salt. Roast for 20 to 30 minutes.
Keep warm: Once all the vegetables are roasted, keep them warm separately.
Prepare the spinach: Rinse, pat dry, and set aside.
Cook the meat: Fry or grill the meat until done to your liking.
Assemble the salad: Combine the roasted vegetables, fresh spinach, and cooked meat. Serve warm.