Heat a frying pan with the coconut oil and fry the portobello mushrooms briefly on both sides until they start to shrink a little. You can tell when they are done.You can do the same in the oven. Preheat the oven to 180˚C and place the portobello mushrooms, stem side down, in the oven. Roast for about 10-15 minutes and drain on paper towels.
Remove them from the pan and place them on baking paper to drain. There is always a lot of liquid coming out of a portobello. Make sure to remove it all!
Meanwhile, fry the beef with the harissa, salt and pepper.
Place the portobello mushrooms on plates and spoon the mince into each.
Top with the cashew nuts and freshly chopped parsley and serve immediately! If the portobello's cooled down too much you can briefly reheat in the oven before serving.