1. In a medium saucepan, combine the tomato puree, apple cider vinegar, Dijon mustard, smoked paprika, and natural sweetener.
2. Place the saucepan over medium heat and bring the mixture to a gentle simmer.
3. Reduce the heat to low and let the sauce simmer for about 10-15 minutes, stirring occasionally, until it thickens to your desired consistency.
4. Taste the sauce and adjust the sweetness if needed. Add more sweetener for a sweeter sauce.
5. Remove the sauce from heat and let it cool completely.
6. Transfer the BBQ sauce to an airtight container or jar and store it in the refrigerator for up to one week.

This simple BBQ sauce is perfect for adding flavour to your BBQ Pulled Pork Tacos or any other dishes you enjoy.