Fit your food processor with the metal blade and turn it on. Drop the clove of garlic in and let it go until finely minced. Add the drained chickpeas and process for a full 2 minutes. Scrape down the sides of the machine as necessary.
When the chickpeas are completely smooth, add the pumpkin, tahini and lemon juice. Process again until smooth.
Add about 1/4 cup of ice cold water through the feed tube while the machine is running, until you reach the desired consistency. You may need a little more water.
Add the salt,cinnamon, and paprika, and then taste to adjust.
Spoon the hummus into a wide shallow bowl, and make a swirl with the back of a spoon. Drizzle the top with olive oil and sprinkle with pepitas and sumac or paprika. Serve with pita bread.