1. Prepare the vegetables: Wash the piri piri chilies and remove the stems. Deseed and roughly chop the red bell peppers. Roughly chop the red onion and peel the garlic cloves.

2. Roast (optional, for depth): For a deeper flavor, you can lightly roast the bell peppers, onion, and garlic on a baking sheet at 400°F (200°C) for 15 minutes before blending. This step is optional but enhances the taste.

3. Blend the ingredients: Combine the piri piri chilies, chopped red bell peppers, chopped red onion, garlic cloves, white wine vinegar, olive oil, fresh lemon juice, smoked paprika, salt, and optional sugar in a blender or food processor.

4. Process until smooth: Blend on high speed until the mixture is as smooth as desired. If the sauce is too thick, add a tablespoon or two of water or extra vinegar until it reaches your preferred consistency.

5. Simmer the sauce: Pour the blended sauce into a saucepan. Bring it to a gentle simmer over medium-low heat and cook for 15-20 minutes, stirring occasionally, to allow the flavors to meld and the sauce to thicken slightly. Be careful as it may splutter.

6. Adjust seasoning: Taste the sauce and adjust salt, sugar, or vinegar as needed. If you prefer more heat, add a pinch of cayenne pepper.

7. Cool and store: Remove from heat and let the sauce cool completely before transferring it to a clean, airtight jar or bottle. Store in the refrigerator.

8. Serve: Enjoy your homemade Piri Piri sauce with grilled chicken, roasted vegetables, or as a vibrant dipping sauce.