Great thread as usual! 2 years ago I made ina garten’s (barefoot contests) make ahead gravy base. It is amazingly delicious, easy, makes a lot & the red onion adds a very meaty flavor. When you finish roasting, I’ve made it with both roasted turkey & roasted chicken drippings, you just add the drippings into your ready made base & heat. It is foolproof & I always have extra which I decant into glass jars & freeze.
A thing I learned making it a 3rd time: instead of removing the onions I let them melt down into the base & the gravy was even richer & more delicious. This recipe is foolproof & on line.
Contessa, NOT contests
This one?
https://www.foodnetwork.com/recipes/ina-garten/make-ahead-turkey-gravy-with-onions-and-sage-5486134