My friend and I are regulars at Mosco but as a public service I present the following, an experience of my friend a mere hour ago. He goes in and orders his ten dumplings and notices that the two hot sauce bottles on the counter are empty. He gets the attention of the friendly women that dishes the dumps and asks if there is more hot sauce. She sends one of her workers next door to the Thai market and the worker returns moments later with a bottle of hot sauce, Sirracha. He then watches as she pours hot sauce from the new bottle into the old bottles, but only about a third of the way and then places it under the tap of the sink and fills it to the top with water. She does that to the other bootle and then finally to the new one. So, if you like your hot sauce hot, bring your own.