To make crispy dosa, you will want to follow some of these tips and suggestions for best results: Heat the dosas over medium heat to make the outside crispy and keep the inside tender. Use a cast iron skillet or other heavy bottom pan for even heating. Adjust the rice to lentils ratio slightly to add a bit more rice. Rice gives the dosa the crispy texture. Make sure to coat the pan in oil or butter. Some people use an onion to spread oil around the pan to help ensure an even layer of oil.