Add the garbanzo beans, pickle juice, tahini, cumin, salt, garlic, lemon juice and some black pepper to a food processor. Pulse to combine. With the food processor running, slowly drizzle in the olive oil, emulsifying the hummus to a creamy, whipped consistency. Turn off the food processor, remove the lid and scrape down the sides of the bowl. Add the fresh dill, secure the lid and pulse until combined, 4 to 5 times. Spoon the hummus into a serving bowl. Drizzle with olive oil and garnish with the diced pickle. Serve with pita chips and sliced cucumber alongside.