The above problem - rated D4 by me - worried the eminent mathematician George W. Hart ( scientist, sculptor and co-founder of MoMath) for over 25 years, so he published in 2003 (revised in 2010)
a long paper dedicated to food pairing and summing up the various candidate solutions to the bolded problem.

Please read his essay (available on the web - named as this puzzle) prior to climbing your discovery train.

Bon voyage!

I must mention that obviously the 3 foods must be distinct products
so a solution like a=b=c=a long shot of vodka
does not qualify as an answer.

May I tell you that your question is wrong, and this is why there is no solution. 

Indeed, there is a myth called "food pairing", but it is not scientific, as food appreciation is a question of art... and art always espapes (aesthetics) laws. 

Moreover, think of Munster Cheese, durian fruits, hot brain of apes in skulls... If someone had it when young, it's good!

Finally, an anecdote: I asked once to my friend Pierre Gagnaire if he would be able to mix the impossible pair camembert cheese+raspberries... and he  did it at once. The recipe is in my book "Cooking, a quintessential art", at California University Press. Moreover, in this case, you need absolutely a poor camembert to get a "good" result. A discussion is given also in the  final chapter of my book "Building a meal" (Columbia University Press)

Best regards
Hervé This