Preheat barbecue to high. In a bowl, mix together onion, salt, lime juice and roasted garlic paste. Set aside.
Grill avocado 1 to 2 min. per side. Remove from barbecue, roughly chop and add to red onion mixture. Mix in tomatoes, cilantro and hot sauce. Serve with tortilla chips.
To prevent this fruit from slipping through the barbecue grates, quarter or halve the avocado and grill flesh side down.