Place fava beans, garlic, salt, 4 T olive oil and the 8 cups water in a saucepan. Cook over medium heat until beans are tender. Drain, reserving 1 1/2 cups of the water. Place beans with reserved water in a food processor and blend until smooth. Return to saucepan; stir in lemon juice and cumin. Cook for 5 minutes over low heat, stirring a few times, then place on a serving platter. Sprinkle with remaining olive oil evenly over the top; then sprinkle with paprika and chili powder. Garnish with parsley and serve.