1. Heat the grill to medium heat. Lightly brush each avocado half with olive oil.
2. Place the avocado halves flesh side down on the grill. Grill for about 5-7 minutes or until the avocados have black grill marks.
3. Remove the avocados from the grill and let them cool to room temperature. Scoop out the avocado flesh and place in a medium bowl. Smash the avocados with a fork and stir in the lime juice, garlic, jalapeno, onion, and cilantro. Season with salt and pepper, to taste. Serve with tortilla chips.