Preheat grill. Brush each quarter with oil on both sides. Grill on each side until blistered, about 10 to 12 seconds on each side.
Spicy Lentil Dip: Place lentils, onion, garlic, pepper and vinegar in the bowl of a food processor. Process until smooth. Slowly add the olive oil. Season with cumin, salt and pepper and pulse 3 times. Remove to a bowl and garnish with cilantro.