How to get rid of thermos flask smell:
Put ½ cup of vinegar in flask and leave for few hours, then wash with cold water.
For nice golden fried onion:
Cut onions and soak in milk for 15 minutes. Then drain and fry in oil, you will get beautiful golden brown onions.
To protect red chilli powder:
Apply peanut oil in jar then put red chilli powder.
If you forgot chickpeas to soaked last night, and would like to cook today. Then fry chickpeas without oil and then cook in pressure cooker.