Drain beans and reserve liquid.
Place garlic into the bowl of a food processor and pulse until minced. Add black beans, 2 tablespoons bean liquid, lemon juice, tahini, cumin, salt, and cayenne pepper; process until smooth, scraping down the sides as needed.
Taste and add additional bean liquid, lemon juice, tahini, cumin, salt, and cayenne pepper as needed. Transfer to a serving bowl and sprinkle with paprika. Arrange Greek olives over top.
