Steps
1. In a small saucepan, heat the vegetable broth over low heat.
2. In a separate pan, heat the olive oil over medium heat and sauté the onions until translucent.
3. Add the minced garlic and cook for another minute until fragrant.
4. Stir in the Arborio rice, allowing it to toast for about 2 minutes.
5. Gradually add the warm vegetable broth, one ladle at a time, stirring constantly until the liquid is absorbed before adding more.
6. After about 15 minutes, when the rice is creamy and al dente, stir in the diced tomato, Parmesan cheese, and basil.
7. Season with salt and pepper, and add butter for extra creaminess if desired. Serve immediately.