Heat saucepan over medium-high heat
Add olive oil and heat until shimmering
Add in onion and cook until translucent
Add in garlic and cook until fragrant
Stir in smoked paprika and cook for 1 minute to bloom the flavor
Add in ketchup, mustard, apple cider vinegar; stir until combined
Stir in brown sugar substitute
Bring to boil and reduce to simmer for 10 minutes, salting to taste
Remove from heat and pour into blender or use immersion blender
Blend until smooth
Allow to cool. Store in airtight container for up to 1 month