Cooking with leftovers - idli manchurian

Has anyone perfected the art of cooking just enough for two people? Let me in on your secret, will you??? I am never able to cook just the right amount. When it is just the two of us, the leftovers are manageable as in they last only for a few servings for the next meal. When I have guests though, I end up cooking much more than is needed. Somehow, I have this weird thing about it being better to have more of a thing that to fall short of it when there are guests.
This morning, I made idlis for breakfast and none of us (that includes the little girl 'coz she's fond of idli) ate any 'coz we just weren't hungry. Here's something that I came up with to use up those idlis. It's close to midnight and my brain refuses to come up with a name for the dish , so let's just call it idli manchurian.There are no set measurements. I just threw in a little bit of whatever I had.

Tear the idlis into little bite sized pieces. Deep fry in hot oil until lightly browned and crisp. Drain and set aside.
In a pan, heat some oil. Add some minced green chillies and a finely chopped onion and saute until the onion starts browning. Stir in a chopped tomato and fry for a few minutes. Reduce the heat and stir in some soya sauce, red chilli sauce and tomato ketchup. When the sauce thickens, add the fried idli pieces and stir well. You don't need to add salt 'coz the salt in the sauces and the idli will be sufficient. Switch off the heat and garnish with freshly chopped corriander leaves.
Serve hot.

This is off to Pallavi's Sunday Snacks - Grab 'n Go event.