constructive feedbacks

I am little worried about giving constructive feed backs.
Giving feedbacks without hurting the person is very important.
Importantly we should not discourage them .
I have tried this little example on my own while I was cooking...
Lets say I am in a house of my friend as a visitor. She gave me good food and all. Actually speaking she is new to cooking , she love to cook. But on day it was not that good , too much salt in her food.
She ask me for feedback; how do I say it .
I cant just say too much salt in ur food. Because I know how much effort she have put in.
I have tried several ways on my own.
1) Food is really nice , It would be better if you could reduce salt a bit.
2)Too much salt in your food, but it is good.
3)You should be bit careful on putting salt next time


........ still I cannot feel what is good one ...