Preheat oven to 350°. Cut garlic bulb in half, lengthwise (see photo above), and place cut side up on foil-lined baking sheet (you will only need one half). Drizzle with olive oil. Roast for 15 minutes, or until edges start to brown.
Once garlic is cool enough to touch, add the cloves from one half of the bulb into the food processor. They should slide right out of peels. Store the other half of garlic in the refrigerator, for a future recipe.
Add remaining ingredients to food processor and blend until smooth. If hummus is too thick add more water (I used all 4 tablespoons).
Before serving, drizzle with olive oil and sprinkle with fresh dill (optional).