Add 2 tbsp. butter to a large frying pan over medium-high heat. Once bubbling, add turkey neck and backbone. Cook, stirring often, until browned on all sides, about 7 minutes.
Add in carrots and mushrooms. Cook for 5 more minutes. Stir in garlic, salt, pepper, rosemary, and bay leaf. Cook for 1 minute, or until aromatic.
Pour in broth and bring to a boil. Reduce heat and simmer for 30 minutes, or until reduced to your liking.
Remove turkey parts, rosemary sprig, and bay leaf. Pour through a fine sieve and mash veggies through the sieve to the best of your ability, making sure to scrape underneath the sieve to get those built up bits into the gravy.
Add remaining butter to the same pan over medium heat. Once bubbling, stir in flour. Whisk frequently for 3-5 minutes, or until mixture has browned. Pour in broth (whisking constantly, and be careful, the mixture will steam up!)
Bring to a boil, reduce heat, and simmer until thickened to your desire, anywhere between 10-20 minutes.
Taste, season accordingly with salt and pepper, and serve over turkey and mashed potatoes!
Notes: I had both the neck and backbone because of the cooking method I used on my turkey (spatchcock.) You can use just the neck or even add in the liver and heart.
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