Weigh the kangaroo fillets and make the dry rub. The rub is 50/50 salt and brown sugar, made to total 10% the weight of the meat. Just to be clear that is 5% salt and 5% sugar, so if the kangaroo weighs 1kg (1000g) you need 50g sugar and 50g salt. Evenly coat the fillets, on all sides, in the rub and set aside in the fridge for three hours. The rub will act similarly to a brine and will help lock some of the moisture in the fillets.
While the meat rests in the fridge setup your smoker, aiming for a steady temperature of 120°C (250°F). I use an upright type smoker with a water pan, and have found the water pan both regulates the temperature and keeps meat more moist.
Once the smoker hits about 90°C (200°F) , throw a handful of woodchips in and smoke the raw macadamia nuts for about twenty minutes, being careful not to burn them. A pizza tray with a perforated bottom is ideal for smoking nuts. Take the nuts out before adding the roo to the smoker.
Grate one pile of parmesan cheese per two people onto a baking tray lined with baking paper. Place the tray into either a very hot (220°C / 430°F or higher) oven, or on the lowest shelf under a hot grill (broiler). Watch the cheese carefully and remove it to cool as soon as it has turned golden. It will harden and be crunchy once cooled. Now you can remove the kangaroo fillets from the fridge and with a damp cloth or paper towel wipe off the excess rub.
Add the kangaroo fillets to the smoker, along with more woodchips. Cooking time will depend on the temperature of the smoker and thickness of the fillets, use a digital thermometer and aim for an internal temperature of 55°C (130°F).Ensure you keep a steady flow of smoke through the smoker over the cooking time to get the best flavour. Prepare the chilli mayonnaise by adding hot sauce to taste.
Make a simple salad by roughly chopping the tomatoes and combining with torn fresh basil leaves. Immediately prior to plating up, add the smoked macadamias to the tomato salad.
To serve, smear a generous dollop of mayo on each plate, pile tomato salad beside the mayo and top with some cracked pepper. Crack the parmesan crisps into halves or quarters and arrange on the tomato salad. Slice the smoked roo fillets into half-centimetre slices and carefully arrange on top of the chilli mayo.