Process the garlic and jalapeno in a food processor until finely chopped. Rinse the beans and drain. Add the beans to the food processor. Process until a paste forms. Scrape down side of the processor bowl. Add the yogurt, lime juice, cumin, salt and cayenne. Process until smooth. Spoon into a bowl.
Reserve a small portion of the tomato and parsley. Stir the remaining tomato and parsley into processed bean mixture. Chill, covered, in the refrigerator.
Heat in a double boiler over hot water at serving time. Spoon into a serving bowl. Sprinkle with the reserved tomato and parsley. Serve with corn chips.