Preheat your oven to 356°F (180°C).
Wash and slice the tomatoes, red chili pepper, and bell pepper, then place them on a baking tray lined with parchment paper.
Chop the onion and carrot and add them to the tray as well.
Drizzle the vegetables with olive oil and sprinkle with dried herbs, salt, and pepper to taste.
Roast in the preheated oven for about 1 hour.
Once the vegetables are nicely roasted, transfer them to a food processor or use your immersion blender and blend into a smooth sauce. Taste and adjust the seasoning if needed.
Let the sauce cool completely before transferring it to an airtight container.