In a large resealable plastic bag, combine the lemon juice, oil and garlic. Add the halibut; seal bag and turn to coat. Refrigerate for 30 minutes., For sauce and salsa, peel and cube avocados. In a small bowl, mash 1/4 cup avocado. Stir in the remaining sauce ingredients. Place remaining avocados in a small bowl; stir in the remaining salsa ingredients. Refrigerate sauce and salsa until serving., Drain fish and discard marinade. Broil halibut 4-6 in. from the heat for 8-10 minutes or until fish flakes easily with a fork. Place fish on the center of each tortilla. Top each with 1/4 cup cabbage, about 1 tablespoon sauce and 1/4 cup salsa.