Roasting nuts is simple and can enhance the flavor of macadamia nuts once they have gone stale. To oven roast macadamia nuts, simply: Pre-heat oven to 250°F (120°C) Spread the macadamia nuts across a baking sheet Place the tray in the oven for 8-10 minutes until the macadamia nuts become golden yellow Then take out the tray and let it cool Optional: Slice or grind the roasted macadamia nuts