Put the garlic in the bowl of a food processor and pulse a few times to chop. Add the garbanzo beans, lemon juice, water, olive oil, tahini, spices, and 3/4 teaspoon salt. Blend until smooth, scraping down the bowl as you go.
Taste and add more lemon juice or salt as needed; to get the right balance of flavors, it should taste bright with lemon juice, rather than heavy with beans and tahini. You can also adjust the consistency with a little more water, if you like (keep in mind that it will stiffen considerably when chilled).
Drizzle with olive oil and sprinkle with pine nuts and parsley before serving (if using).