Homer's Odyssey - eating tzatziki

I've been reading the Puffin Classics edition of Homer's Odyssey, retold by Geraldine McCaughrean.  I was intrigued to read:
"She gave him fresh warm bread and bowls of tzatziki, with whey to drink, and peeled fruit, and parsley in soft cheese.  At least, it looked rather like parsley, that sprikling of green."

And


 "The meal she laid before him - tzatziki and olives, peeled fruit and cheeses, wine, honey and fresh warm bread ....................."

 Homer was probably born about 725 B.C.  Eating tzatziki?

I've looked in Samuel Butler's translation of 1900 and haven't yet found the passages mentioning anything like tzatziki.......................