We had a couple of people over for a festival and we were exchanging naivedyam. Theirs was a bit bland and ours was tasty as usual. Then the lady says she did not taste it while cooking as it is said that we should refrain from tasting the naivedyam before offering it to God. That pushed me to put this ranting on paper. One side of the coin is that as a cook your job is to know a person's taste without needing to taste the food while cooking and yet be sure of the perfectness of the food. It takes experience/practice/passion to do that. But for people who lack in this area, I think it is not wrong to taste it before offering to God. I do not support the notion that tasting a food before offering it to God contaminates the food in any way. For us or for our relatives, we sometimes taste it to check if it will satisfy us or our guests. I see no harm doing the same with naivedyam*. It depends on what one believes. As for me, I can tell if the flavours and spices are sufficient without tasting. But I do taste it to confirm that I'm right. It's no different than getting the right answer to a question :) Now you think I'm crazy....no problem :)
People, how can God be offended when you just want to make sure he/she gets tasty food? This

So if you are devoted to God, the little things like what you offer and how you offer will never matter.
patram pushpam phalam toyam
yo me bhaktya prayacchati
tad aham bhakty-upahritam
ashnami prayatatmanah
(If one offers Me with love and devotion a leaf, a flower, fruit or water, I will accept it.)
(Bhagavad Gita 9.26)
* Naivedyam is created by a process of giving and receiving between a devotee and God. It is any material thing we offer to God along with prayer and then distributed in the God's name. The Naivedyam has the deity's blessing residing within it.