Momos are really good but the wait is long, the service a little slow and was expecting more of a stewed curry. This was just soup curry, which was fine but not really worth the hype.
No need to add any toppings. It already have egg and veggies. If you must, one recommendation is 'おふ&ゴマ(ofu and sesami) topping is good. Ofu soak the soup and gets light dumpling dough texture.