Yes, the Sisko used real turkey. From DS9 "Blaze of Glory" [
http://www.chakoteya.net/DS9/521.htm]:
EDDINGTON: Replicator entrée number one oh three. Curried chicken and rice with a side order of carrots. Or at least that's what they want us to believe. But you and I both know what we're really eating. Replicated protein molecules and textured carbohydrates.
SISKO: It's not that bad.
EDDINGTON: It may look like chicken, but it still tastes like replicated protein molecules to me.
SISKO: If you don't want it, don't eat it.
EDDINGTON: Remember that Thanksgiving dinner you cooked for the senior staff last year? How many months did it take you to grow all those vegetables in the hydroponic garden? Every ingredient fresh, real. Though you did put too much tarragon in the stuffing.
SISKO: I wasn't aware that you were a food critic.
EDDINGTON: I wasn't, until I joined the Maquis and started eating real food. Food that I'd grown with my own hands. Fresh corn, sweet as a baby's smile. And tomatoes. Do you know how hard it is to grow tomatoes? There's always too much rain or not enough. It's too hot, it's too cold. I wonder what happened to those tomato plants? Probably burned to the ground along with everything else.
The Thanksgiving dinner is presented as having
all real ingredients as opposed to the replicated meat and vegetables of replicator entrée #103.