Preheat oven 400 degrees Line a large baking sheet with foil or use a slip mat. In skillet heat oil over med. heat. Add onion and 1 1/2 tsp. of caraway seeds. Cook until onion softens. Remove from heat and stir in sauerkraut.
On lightly floured surface roll out pizza dough into a rectangle. Transfer to pan. Spoon sauerkraut mixture down center length of dough in 4 inch wide strip with 1 1 and 1/2 inch border on each short side.
Top sauerkraut with corned beef and cheese. spoon dressing over top. Fold short sides over filling. Cut eight 1 inch wide strips crosswise in dough of each side of filling.Crisscross strips over top. Brush the top with egg mixture. Sprinkle the other 1/2 tsp. caraway seeds on top Bake until golden about 30 to 35 min.