If you want to keep your Samsoas crispy and crunchy, you need to avoid using Onion or any such vegetables in the mixture. These veggies, especially Onions, tend to release juices in the mixture, which makes the outer cover soggy after frying. Along with this, you should also consider using cold water for kneading the dough. These couple of tips will help in preventing the soggy texture for your Samosas.