Into the bowl of a food processor, pour in beans, lemon juice, cumin, salt and pepper. Squeeze both halves of the roasted garlic head into the food processor. The roasted cloves should pop right out. Turn machine on and drizzle in 3 Tablespoons of olive oil, processing until desired consistency has been reached. Taste and adjust seasonings to your liking-more salt, more cumin, more lemon juice, etc.