Cut the mango flesh from the pit in large slices and arrange on a baking sheet. Sprinkle with salt, black pepper and cayenne, to taste. Drizzle with olive oil. Turn them over and sprinkle the other side with the seasonings and a drizzle of olive oil. Put on the grill for 1 to 3 minutes, grilling on both sides. Remove from the grill to a serving dish and sprinkle with the lime juice. Drizzle crema over the mangos and garnish with jalapenos and cilantro. Serve.