Preheat oven to 180°C. Cut pumpkin and onions into wedges, and red capsicum into wide strips. Place vegetables onto a baking paper lined oven tray, drizzle with 1 tbsp olive oil and season with salt and pepper.
Roast vegetables for 25–30 mins until tender and golden. Cool slightly.
Allow steaks to come to room temperature for 20 mins. Drizzle with oil and season with a pinch of salt and pepper.
Heat a heavy-based pan or BBQ to high. Cook steaks for 3–5 mins per side, or until cooked to your liking. Transfer to a board, cover loosely with foil, and rest for 5 mins.
Whisk dressing ingredients together and season to taste. Arrange greens on a large platter, top with roasted vegetables, crumbled feta, and nuts. Drizzle with dressing.
Serve steaks with roasted vegetable salad.
Steak can also be sliced and tossed through the salad for a one-tray dish.