Macadamia nut oil is ideal for pan-frying fish or veal, and for marinating BBQ meats. It may also be used to flavour your cakes and slices and other favourite recipes. Beneficial and nourishing to dry skin if used externally. How to use macadamia oil? Macadamia oil is fast becoming a favourite cooking oil, chef’s love the mild nutty flavours and very high heat tolerance.