Question: what is the purpose of egg wash in baking
[{'answer': 'bind pastry parts together', 'provenance': [{'wikipedia_id': '23218400', 'title': 'Egg wash', 'start_paragraph_id': 3, 'start_character': 170, 'end_paragraph_id': 3, 'end_character': 196, 'bleu_score': 1.0, 'section': 'Section::::Use in pastries.\n'}]}, {'answer': 'to make pastries shiny and golden or brown in color'}, {'answer': 'to help toppings or coatings stick to the surface of the pastry'}, {'provenance': [{'wikipedia_id': '23218400', 'title': 'Egg wash', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 472, 'bleu_score': 0.978375183951072, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3464891886713132089}, 'section': 'Section::::Use in pastries.\n'}]}]