Place garlic, jalapeño, and cilantro in the bowl a food processor (or canister of a blender). Pulse until finely chopped, scraping down sides halfway through. Add black beans, cumin, garlic salt, chili powder, oregano, pepper, lime juice, vinegar, and 2 tablespoons water to food processor. Process until all ingredients are smooth, adding additional water one tablespoon at a time (if necessary) until preferred consistency is reached. Taste and adjust seasonings as desired.
Garnish with cilantro. You can also add a little cheese (cotija, cheddar, Monterey Jack, etc.) and a sprinkle of diced tomatoes for color. Serve as a dip with tortilla chips or raw vegetables.
Most of the heat in a jalapeño is housed in its seeds and membranes. So scrape out and discard them for a milder dip, and leave them intact if you like some heat.