In a large bowl, combine the first seven ingredients. Unroll one tube of crescent dough onto an ungreased baking sheet; seal seams and perforations.
Spread half of corned beef filling down center of rectangle. On each long side, cut 1-inch wide strips to within 1-inch of filling. Starting at one end, fold alternating strips at an angle across filling; seal ends. Repeat with remaining crescent dough and filling. Brush beaten egg white over braids; sprinkle with sesame seeds.
Bake at 375 for 25-30 minutes or until golden brown. Cool on wire racks for 5 minutes before cutting into slices. Refrigerate leftovers.