I've always loved the idea of apple stuffing tucked inside tender meat, but keeping it kosher means swapping out the pork for something just as delicious. Turkey tenderloin works beautifully here, and honestly, it might be even better than the original. The meat stays incredibly moist while the apple stuffing gets all those wonderful flavors from the herbs and onions. This recipe came about when I was trying to recreate a dish my grandmother used to make, but with kosher ingredients. She'd tell stories about her own grandmother making something similar back in Eastern Europe, though the exact details got a bit fuzzy over the years. What I do know is that the combination of sweet apples with savory herbs creates something really special. The key to success here is butterflying the turkey tenderloin properly. You want it thin enough to roll easily but not so thin that it tears when you're working with it. I use a meat mallet to even things out, and it makes all the difference. The stuffing itself is pretty forgiving. I like using Granny Smith apples because they hold their shape well and add just the right amount of tartness. This makes an elegant dinner for Shabbos or holidays, but it's actually simple enough for a regular weeknight too. I serve it with roasted vegetables or a simple salad. The flavors work well with both sweet and savory sides, so you've got plenty of options.