Method

In a food processor, add the drained black beans, tahini, avocado, garlic, cumin, lemon juice, parsley and season.
Cover and turn on processor.
While the processor is on, start to add the oil in a slow steady stream through the hole at the top of the processor.
Run until the hummus is smooth, about 2-4 minutes.
If you find the hummus dry you can slowly add small amounts of the reserved black bean liquid to get a rich, smooth, creamy consistency.
Store in an airtight container in the refrigerator for 3-5 days.
Bake your own pita chips. Pre-heat the oven to 350°F
Cut the pita bread into small triangles and place in a baking pan.
Place baking pan in the oven for about 10-12 minutes or until the triangles are crispy and toasted.
Remove, allow to cool and serve with the hummus.