Preheat the oven to 400 degrees Fahrenheit.
Cut the tomatoes in half lengthwise and remove the stems.
Peel the onion and cut it into quarters.
Peel the garlic cloves.
Arrange the tomatoes, onions, and garlic on a baking sheet.
Drizzle olive oil over the vegetables.
Season with salt and pepper, then mix everything together until well combined.
Place the baking sheet in the preheated oven and bake for 40 minutes. Afterward, remove it from the oven and let it cool for 10 minutes.
Transfer everything from the baking sheet, including the accumulated juices, to a blender.
Add the tomato paste to the blender and blend until the mixture becomes smooth.
Add broth until desired consistency is reached
Serve with toppings of choice