To you need:
1/2 cup olive oil
1/2 Tablespoon cider vinegar
1/2 cup finely chopped shallots
1/3 cup drained capers, coarsely chopped
1/4 teaspoon salt
1/2 teaspoon pepper
3 pounds asparagus
What to do:
Whisk olive oil, vinegar shallots, capers, salt and pepper in a bowl until combined.
Steam asparagus in rack over boiling water, covered until tender, or 6 minutes.
Transfer asparagus to a platter and top with vinaigrette.
Serve warm or at room temperature.