Preheat oven to 180ºC.
Cut the salmon into chunks and place onto a baking tray lined with parchment paper along with the whole cherry tomatoes.
Add the balsamic, olive oil, maple syrup and a sprinkle of black pepper to the tray, then using a spatula mix the sauce well to completely coat the fish.
Bake in the oven for 12 minutes, then take the tray out of the oven and remove the tomatoes (set them aside for later). Place the fish back in the oven for a further 12 minutes. The sauce should become thick and treacly. Remove from the oven and leave aside.
To make the skewers, add a cube of fish followed by a little mozzarella, a leaf of basil followed by a tomato and repeat until the skewers are filled up.
Drizzle over the remaining sauce from the salmon tray to serve.