Heat oven to 375°F. Spray large cookie sheet with nonstick cooking spray. In small bowl, combine crabmeat, cream cheese, onions and garlic salt; mix well.
Unroll both cans of dough; separate into 16 triangles. Cut each triangle in half lengthwise to make 32 triangles.
Place 1 teaspoon crab mixture on center of each triangle about 1 inch from short side of triangle. Fold short ends of each triangle over filling; pinch sides to seal. Roll up. Place on sprayed cookie sheet.
In small bowl, combine egg yolk and water; mix well. Brush egg mixture over snacks. Sprinkle with sesame seed. Discard any remaining egg mixture.
Bake at 375°F. for 15 to 20 minutes or until golden brown. Serve warm snacks with sweet-and-sour sauce.