No. The word is tastier. Some words allow one to use more and some add er to the end: smarter, stronger, nicer, bluer; lighter, heavier, etc. More is used when it isn't appropriate to add er to the end of the word, such as more transparent, more decorated, more finished, more excited.

The word "whether" introduces an either or statement. "Whether or not you are sick, you are going to school." "Whether they win, lose, or tie, they played well." With regard to sentence structure, the comma is being used to separate a list of items as the previous poster stated. The last comma is to insert a pause and then make the final statement. Hope this helps.