1To make mayonnaise, in blender or food processor, place tofu, lemon juice, mustard, salt, shallot and garlic. Cover and blend on medium speed until smooth. With blender on, add oil by drops. Place in glass or plastic container; stir in tarragon. Cover and refrigerate at least 1 hour or until chilled.
2Place steamer basket in 1/2 inch water in saucepan or skillet (water should not touch bottom of basket). Place asparagus in basket. Cover tightly and heat to boiling; reduce heat. Steam 6 to 8 minutes or until crisp-tender. Serve with mayonnaise.