Prepare the ingredients: wash the chili peppers, remove the stems, and deseed them if you prefer a milder sauce. Peel and finely chop the garlic and onion.
Heat the olive oil in a medium saucepan over medium heat. Add the chopped onion and sauté until translucent, about 3-4 minutes.
Add the chopped garlic and chili peppers and sauté for another 2-3 minutes, until fragrant.
Pour in the light beer, then stir in the tomato puree, brown sugar, and vinegar. Mix well to combine.
Season with salt and pepper, then bring the sauce to a simmer and let it cook for 20-25 minutes, or until it has thickened.
Once thickened, remove from the heat and let it cool slightly. Then, using an immersion blender or a regular blender, blend until smooth and silky.
Pour the sauce into a clean jar and store it in the refrigerator. It's excellent with grilled meats, burgers, or roasted vegetables.
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