To roast garlic: Preheat oven to 400 degrees F. Cut off top of garlic head so bulb stays intact but cloves are exposed. Remove any loose skin. Place garlic head, cut side up, in a ramekin or foil. Drizzle with 1 tsp. of the olive oil. Cover; bake 25 to 30 minutes or until soft. Let cool.
Squeeze garlic into a food processor or blender; add remaining 3 Tbsp. oil, the beans, lemon juice, and salt. Cover; process until smooth. Transfer to a serving bowl. To serve, drizzle with additional olive oil; sprinkle with pepitas and chopped carrot. May be chilled 24 hours.