1-While setting yogurt add a little milk powder. you will get a sweet flavour & the curd will remain same for 2-3 days.
2-While kneading the dough use warm water instead of normal water ...
and keep the dough in a wet cloth or wet tissue for some time then try making the chapatis ... this really helps in getting Soft Rotis /Chapatis .
3-To enable the reuse of cooking oil for a fresh recipe, cut a small piece of ginger & fry in the oil,it removes anylingering odours/ flavours.
4-Add a little milk to onions while frying, this will help retain a rich colour & prevent them from burning.
5-:Add a few drops of lemon juice in the water before boiling the rice to make rice whiter.
6-To make Dosa cripsy add little sugar in the paste.
7-To preserve lemons for long,coat them with cocunut oil &refrigerate them in a open container.
8-Make ripe tomatoes firm again ......... dip tomatoes in cold water , add some salt and leave overnite ..
9-If your gravy/ dal has too much salt, make some dough balls (atta balls) and drop them in. As the gravy boils, the balls will take in salt. Discard the balls later, and your gravy will be fine.
10-While blanching spinach , add a pinch of salt.this helps in retaining it's green colour.(DO not over cook,of course)