Heat ¼ cup olive oil on stove and add the ¼ white onion.
Add the hot and sweet pimenton, as well as the cayenne pepper and minced garlic.
Add the all-purpose flour and cook on medium heat for 5 minutes, stirring frequently.
Slowly whisk in the chicken stock and cook for an additional 10 minutes.
Add the tomato puree and cook for an additional 20 minutes.
Taste and add salt and sherry vinegar until it tastes lovely.
Remove sauce from heat and allow to cool slightly.
Blend sauce using an immersion blender until smooth.
Taste again and contemplate whether more salt or sherry vinegar is needed.
Add more salt or sherry vinegar as desired.