In a quiet corner of Capitol Hill, wedged between a 7-Eleven parking lot and a teriyaki joint, lies Aviv Hummus Bar, a bright antidote to its ho-hum surroundings. Falafel takes a quick dip in the fryer before it arrives, hot and fresh, as does warm pita alongside a bowl of creamy hummus: A wooden pestle swirls the Levantine spread, creating a well for tahina and whole chickpeas bathed olive oil.