Preheat the oven to 370º F. Arrange the pumpkin cubes on a greased or lined oven tray. Brush them lightly with olive oil and sprinkle with salt and pepper.
Roast until lightly browned.
Combine the spinach, walnuts, tomatoes and pumpkin in a serving bowl and toss gently. Drizzle with oil and lime juice and serve.
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