db={products:[{"_id":ObjectId("5808d700536d1a3d69f4cf51"),"restaurant":["Mcd"],"receipe":[{"burger":[{"name":"Paneer Burger"}],"curlet":[{"price":"21"}]}]},{"_id":ObjectId("5808d700536d1a3d69f4cf53"),"restaurant":["Dominios"],"receipe":[{"burger":[{"name":"familyburger"}],"curlet":[{"price":"21"}]}]},]}

db.products.aggregate([{"$unwind":"$receipe"},{"$unwind":"$receipe.burger"},{"$sort":{"receipe.burger.name":1}}])