All I can say to introduce rennet is if you have not cooked with it before, then great!, we are entering new territory together.
The easy definition of rennet is this: it’s a little tablet that is used to turn milk to cheese. Just as you have to inoculate milk with yogurt to make yogurt, you introduce rennet, an enzyme, into milk to encourage its proteins to coagulate and separate into curds and whey.
If we want to get into the history of it, rennet is wild and weird the same as yogurt. It reaches back to the olden days in the Middle East, when somehow a daring eater thought that the milk that had sloshed around in the stomach of an animal (the fourth stomach of an unweaned calf, to be precise) was appealing for a whole host of reasons (preservation had to top the list over imagined flavor for that first daring eater, but hunger is a strong impulse), then started using the enzymes from the animal stomach’s lining to coagulate and preserve milk themselves.
Rest easy, though, knowing that the rennet you buy today is vegetarian. It’s made by Junket, which is a brand but it also refers to a custard dessert (or, even better, a press trip). The box in my mom’s kitchen cabinet in Michigan was so old-fashioned looking I assumed it had been in there since my childhood. I also assumed that finding a box of Junket while visiting the family in south Florida would be about as easy as finding a bag of za’atar up north.
I started with the cream of the crop and called Whole Foods: N. O. Then I looked up Middle Eastern markets, of which there were exactly none. One place seemed remotely possible; I called and a guy with an Arabic accent laughed at me. “Not down here,” he said. So my next go-to would be Goodrich’s in East Lansing. If they had it, which of course they did, I would bribe one of my friends up there to pick it up and send it to me. I almost overlooked Publix, a Florida grocery that is in every strip mall from the pan handle to the keys, without even asking them; somehow I got my beach-brain revved up and called them too. Yes! Lots of Junket! The older set down here must still be making the puddings of their youth with rennet? I can’t imagine there’s a whole lot of home cheese-making going on, but who knows.
The box looks exactly like the old-fashioned one my mom has up north, so maybe hers isn’t so old after all. The yesteryear slogan on the recipe insert reads: Whether 6 months old or 6 feet tall, use Junket rennet tablets for them all.
Clearly this rennet, this Junket, is kind of strange. But I promise you that the Lebanese cheese we’re making is far from it. This cheese is pure white, mild, delicious, super-traditional, and I feel strongly you’re going to want to make it with some good milk and the rennet you pull of the shelf next time you’re at any old grocery store.