1. Preheat broiler.
2. Heat oil in a large nonstick skillet over medium-high heat. Combine cumin and salt; sprinkle evenly over pork. Add pork to pan; cook 2 minutes on each side or until done. Let stand 5 minutes; cut into thin slices.
3. Hollow out top and bottom halves of bread, leaving a 3/4-inch-thick shell; reserve torn bread for another use. Place bread halves, cut sides up, on a baking sheet. Broil 2 minutes or until golden brown.
4. Place beans and salsa in a small bowl; mash with a fork until almost smooth. Spoon bean mixture into the bottom half of baguette. Top with pork, cheese, onion, tomato, jalapeño, avocado, and top half of baguette. Cut into 4 pieces.