Place artichokes upside down in a steamer basket; place the basket in a saucepan over 1 in. of water. Bring to a boil; cover and steam for 25-35 minutes or until or until leaves near the center pull out easily. Remove artichokes from the basket. Invert artichokes to drain for 10 minutes; refrigerate until chilled.
Meanwhile, in a small bowl, combine the mayonnaise, mustard, onion, Worcestershire sauce and hot pepper sauce; stir in crab. Cover and chill for several hours.
Just before serving, transfer crab dip to a serving bowl. Remove leaves from artichokes to use as dippers.