1. Preheat the oven to 375°F (190°C).

2. Slice the ciabatta in half lengthwise and place it on a baking sheet.

3. Spread tomato paste evenly over the cut sides of the ciabatta.

4. Sprinkle shredded mozzarella cheese on top of the tomato paste.

5. Bake in the preheated oven for about 10-12 minutes, or until the cheese is melted and bubbly.

6. Remove from the oven and let it cool slightly before serving.

7. Slice into individual portions and enjoy!