- 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.