Of what did they taste?

[Firefoot]

Balrogs taste like chicken, or so I've heard on many occasions. Most likely they taste like chicken wings

Well, I've heard that it's just the Balrog's wings that taste like chicken wings. The rest of them tastes like corresponding parts of the chicken.

Hey... Morgoth destroyed Elves to make Orcs, copied Ents to make Trolls, and (drumroll please) enlarged and destroyed chickens to make Balrogs! Except, the enlargement went slightly askew and Balrogs now have even less flying capabilities than chickens.