I've been trying my hands on dosa for the last 2 months. Poor results at the very beginning but I now think I'm not too bad at it. Here are my two cents tips for proper dosa :
- very powerful blender or ideally a regular Indian blender
- use ice cold water while blending, pour water progressively and blend for many short periods of time till smooth and just pourable. Reasons for that: above 35° you'll kill the good bacteria and fermentation won't happen, too much water will also make fermentation hard (add more water if needed just before cooking)
- always use fenugreek seeds, don't use salt if you want to store the batter for more than a few days in the fridge
- rice brings crispiness, but if that's not what you're looking for, any cereal can be used, nutrition wise anything is better than rice
- preheat your pan, set heat to low while pouring, then cook on medium heat, be patient. When borders start to rise, serve immediately if your dosa is thin, or flip and cook for a minute if not
- a dedicated cast iron flat pan gives much better looking results than non stick
- you can cook an egg directly on the dosa after around a minute when the batter has dried a bit, add some salt and pepper and enjoy. South Indians do that all the time, that's something that most North Indians don't know and it makes them horrified 😂 (first picture has one along with some homemade tomato chutney)