In a small bowl or liquid measuring cup, mix the ingredients in the dressing and set aside.Peel the asparagus and slice them into 1-inch pieces.Blanch the asparagus: boil a medium saucepan of water; add the asparagus and cook for 1 minute until it is bright green.Drain the asparagus and go under cold water or under a bowl of ice water. Dry the asparagus and place in an average salad bowl.
In a bowl, add the chopped onions and mint with asparagus and mix with the vinaigrette