Prick the sweet potatoes 3 times with a fork, brush with oil, season with salt, place on a baking tray lined with baking paper.
Approx. 45 mins. in the centre of an oven preheated to 220°C. Remove from the oven, slice down the middle, push apart slightly. Top with the tomato sauce and mozzarella, add the salami.
Approx. 10 mins. in the centre of the oven. Garnish with basil.