Cut 1 inch off of the bottom of the asparagus. Discard. Heat pan over medium heat. Add extra virgin olive oil. Add onion and cook for approximately 3 minutes or until onion starts to soften.
Place the remaining ingredients in a saucepan, except lemons. Squeeze quartered lemons into same saucepan and place lemon in as well. Fill pan with enough water to cover the asparagus half way and cover.
Cook at medium to high heat until the asparagus is bright green and tender (2-3 minutes). Place asparagus and onion on platter to serve. Garnish with sliced lemon.