Pat the turkey leg dry with paper towels and season evenly with sea salt and black pepper.
Heat the olive oil in a heavy-bottomed pot or Dutch oven over medium-high heat.
Sear the turkey leg on all sides until the skin is golden brown and crispy, then remove and set aside.
In the same pot, add the diced onion, carrot, and celery, sautéing for 5 minutes until the vegetables begin to soften.
Add the minced garlic and cook for 1 minute until fragrant.
Pour in the chicken bone broth, scraping the bottom of the pot to release any browned bits.
Stir in the cooked navy beans and place the turkey leg back into the pot along with the rosemary sprig.
Bring the liquid to a gentle simmer, then cover and reduce heat to low.
Braise for 75 to 90 minutes, or until the turkey meat is very tender and easily pulls away from the bone.
Remove the rosemary sprig and serve the turkey leg over a generous portion of the savory beans and broth.