Add the chickpea, garlic and parmesan to a food blender and blend on low until the chickpeas are fully ground- 1-2 minutes

Add the basil leaves to the processor and start processing on low, then slowly add the oil as it processes until the leaves break down and mix into the rest of the ingredients, then add the vinegar

Slowly pour in the water until the sauce begins to resemble your desired consistency.

Taste the sauce, add salt and pepper as desired and pulse to combine.