In the same pan, add 1 more tablespoon of olive oil and sauté the onion until soft and translucent, for about 5 minutes.
Add garlic, cook for 1 minute.
Stir in sweet and hot paprika, cooking briefly to release their aroma.
Sprinkle the flour, stirring constantly to make a light roux, for about 1–2 minutes.
Slowly pour in the stock while whisking continuously to avoid lumps.
Simmer gently until the sauce thickens, for about 3-5 minutes.
Stir in vinegar, and season with salt and pepper to taste.
Pour the sauce into a blender and process until perfectly smooth.