Sweat onions in olive oil until caramelized. Add garlic. Saute 30 seconds or until fragrant.

Add black beans. Toss. Season.

Add vinegar. Cook until nearly evaporated.

Transfer to a food processor or use a stick blender. Add apple cider little by little to achieve desired consistency.

Variations; White vinegar, cilantro, lime, smoked paprika, tequila, cumin, cayenne, jalapeno