Preheat the oven to 200°C. Lightly grease a baking sheet with olive oil.
1 Roast tomatoes Arrange the cherry tomatoes and onion quarters on the baking sheet . Drizzle the olive oil over and season with salt. Roast for 15 minutes.
2 Risotto Heat the olive oil in a deep saucepan or pot and fry the onion until soft. Add the garlic and oregano and fry until fragrant. Stir in the tomato paste.