I did some research, and found several synonyms for flavour, including:
Taste, savor, tang, seasoning, tastiness, tang, relish, bite, piquancy, pungency, spice, spiciness, and zest
However, many of these aren't too helpful, because the context is for yoghurt.
By the way, one other little question: is it correct English to say the context is for yoghurt?