Wrap a sushi mat with cling film and place a nori sheet on top.
Spread the rice evenly over it, leaving about 1-2 cm at the top and bottom.
Then spread the toppings of your choice on top (cream cheese, spinach, avocado, mango, tomatoes and walnuts). Now roll everything together with the sushi mat, applying some pressure as you go.
Finally, cut the roll into equal pieces.