In a saucepan, combine the brown sugar, vinegar, soy sauce, oil, lemon juice and garlic powder. Bring to a boil. Reduce heat; simmer, uncovered, for 5 minutes. Refrigerate until cool. , Meanwhile, in a large skillet, bring 1/2 in. of water to a boil. Add asparagus. Reduce heat; cover and simmer for 3-5 minutes or until crisp-tender. Drain and rinse in cold water., Place asparagus in a large resealable plastic bag; add marinade. Seal bag and turn to coat; refrigerate for 2 hours or overnight, turning occasionally. Drain and discard marinade. Place asparagus on a serving plate; sprinkle with pecans.