Sour Espresso Shot: Troubleshooting Your Extraction
Iced Orange Espresso, Sour Syrup of Yuzu Mixed with Sweet Honey at the Bottom of a Plastic Cup Top with Concentrated Espresso Shot Stock Photo - Image of beverage, diet: 196983126
Sour shots? : r/espresso
Sour Coffee and Extraction (and how to fix it)
Ask Gail: How To Fix A Sour Espresso Shot - YouTube
How to Fix a Sour Espresso - Breville Barista Express - YouTube