Preheat oven to 375°F.
Combine oil and garlic in custard cup.
Cover with foil.
Bake until garlic is soft, about 35 minutes.
Meanwhile, cook malanga in large saucepan of boiling water until very tender, about 35 minutes; drain.
Transfer malanga to large mixing bowl.
Add 1 cup broth, roasted garlic, oil and beat with electric mixer until fluffy and almost smooth.
Season with salt and pepper to taste.