Place all the ingredients in a large pot and bring it to a simmer. Simmer for 30 minutes.
Pass it through a sieve or colander and reserve the stock.
For the risotto
Preheat your pot over medium heat with olive oil.
Add the onion and cook it until it's translucent and smells sweet.
Add the cherry tomatoes cut in half and cook them until they fall apart, mixing every once in a while.
Add the tomato paste, mix it in and cook it for a minute.
Add the white wine and let it evaporate completely before going on with the recipe.
Add the rice and stir for one minute.
Add the stock a bit at a time, stirring constantly. As it evaporates, add more stock. Once you feel that the rice is only slightly crispy, stop adding liquid.
Add the parmesan cheese, salt and pepper. Mix them in. Evaluate if it doesn't need more stock. It should go back to its place when you pass the spoon down the centre, it shouldn't be thick.
Add the mozzarella spheres cut in half, the basil and quickly mix.
Serve immediately with the roasted cherry tomatoes.
Para los tomates cherry al horno
Mix the cherry tomatoes with olive oil, salt and pepper.
Bake them for 20-30 minutes or until soft and golden at 200°C / 390°F.
Notes
Si quieres empezar el risotto para servirlo más tarde, deja el arroz a medio cocer. Luego cuando lo quieras terminar agregas el caldo y continúas la cocción.