In a medium sized pot, add the olive oil, minced garlic and chopped onion and place over medium heat. Season lightly with salt and pepper then sweat for 1-2 minutes.
Once the onions and garlic have softened, add the can of tomatoes, brown sugar and balsamic vinegar. Increase the heat and allow the sauce to come to a simmer.
Simmer for 15 minutes then remove from heat and blend using an immersion blender. Adjust seasoning with salt and pepper as necessary.
