whoa 25 year balsamic. Must try that. I just got a 18yo that I love. It's so syrupy with this great molasses quality (and I don't like molasses). I only had white asparagus once (well cooked fresh). It was done in my favorite preparation. Skin the stalks up to the top 1/3 tip (I used to cut everything off and only keep the top 1/3rd). This way you use the entire asparagus without just using the top 1/3 tips, or worse have the entire stringy bottom stuck in your teeth. The amazing thing is the center of the lower area tastes amazing and so tender (I cut like the last 1/5th off).
Put a pan on highest heat, enough water to barely cover the bottom of the pan (not even cover). Put asparagus in the pan with water boiling. Add pepper, sea salt, little bit of lemon juice, crushed but not chopped clove of garlic. As the water boils away a little fruity extra virgin olive oil. Make sure you let the asparagus sit on 1 side till it starts to brown, don't keep tossing them. let it carmelize. Add a pad of butter (zest of some orange or lemon) at the end and mix it up, take off heat. Should be fork tender but still a little firm.
It takes about 5 minutes to cook and tastes awesome. Still makes your pee smell though.