Baked Stuffed Onions with Ground Turkey and Sage
Large sweet onions hollowed out and filled with ground turkey, mushrooms, and sage, then baked in bone broth until the shells are soft enough to cut with a spoon.
Why You'll Love This Recipe
One package of ground turkey has to feed four people properly, and this is how I get there. The onions are the meal here, not the vessel. Baked cut side up in a little broth for over an hour, they collapse into something sweet and silky that you eat with a spoon, and a modest amount of meat tucked into each shell is plenty because the onion around it is doing so much. It smells like a roast chicken dinner while it bakes, which is a good deal for something that costs almost nothing. I usually put it in when I get home and let it go while I do other things.
Two details make the difference. First, the onions get a short simmer in salted water before they are hollowed, which softens the outer layers so the shells hold their shape rather than splitting in the oven. Second, the scooped-out centers do not go in the trash. They get chopped and cooked down with the mushrooms until both are deeply browned, and that is where all the savory depth in the filling comes from, since there is no cheese or breadcrumb in it to fall back on. Cook that mixture longer than feels necessary. When the pan looks dry and the mushrooms have gone dark, you are there.
Ground turkey on its own can be flat, so it wants three things: the browned mushrooms for depth, dried sage and fresh thyme for the warm woody note that makes people think of holidays, and a tablespoon of cider vinegar stirred in at the end to sharpen the whole bowl. Two halves make a real dinner, with the broth from the bottom of the dish spooned over them, and it is the sort of plate that goes quiet at the table for a minute. Whatever is left is even better the following day, chopped up shells and all, and warmed in a skillet until the edges catch and the filling crisps in the fat.
Ingredients
- 4 very large sweet onions (about 2 1/2 lb total), peeled
- 1 1/4 lb ground turkey
- 8 oz cremini mushrooms, finely chopped
- 4 cloves garlic, minced
- 3 tbsp olive oil, divided
- 1 1/4 cups chicken bone broth
- 2 tsp dried rubbed sage
- 1 tbsp fresh thyme leaves
- 1 tbsp apple cider vinegar
- 1/4 cup chopped fresh parsley
- 1 1/2 tsp fine sea salt, divided
Instructions
- Simmer the onions: Peel the onions and cut them in half through the equator. Bring a large pot of salted water to a boil, slide the halves in, and simmer for 8 minutes, until a knife goes into the outer layers easily. Lift them out with a slotted spoon and set them cut side down on a towel to drain and cool.
- Hollow the shells: Heat the oven to 375°F (190°C). When the onions are cool enough to handle, use a spoon to scoop out the centers, leaving a shell 2 or 3 layers thick. Chop the scooped centers finely. Set the shells cut side up in a baking dish that holds them snugly.
- Brown the filling base: Heat 2 tablespoons of the olive oil in a large skillet over medium-high. Add the chopped onion centers, the mushrooms, and 1/2 teaspoon of the salt, and cook for 10 to 12 minutes, stirring now and then, until the liquid has cooked off and both are deeply browned. Add the garlic, sage, and thyme, and cook 1 minute more.
- Mix in the turkey: Take the skillet off the heat and let it cool for 5 minutes. Add the ground turkey, the cider vinegar, and 1/2 teaspoon of the salt, and mix with your hands until it is evenly combined. The turkey goes in raw and cooks through inside the onions.
- Fill and bake: Mound the filling into the shells, pressing it down so it holds together. Pour the bone broth around the onions, brush the tops with the remaining tablespoon of oil, and season with the last of the salt. Cover with foil and bake for 45 minutes, then uncover and bake 20 to 25 minutes more, until the tops are browned and the filling reads 165°F (74°C).
- Rest and serve: Let the dish sit for 10 minutes so the onions firm up enough to lift cleanly. Serve two halves per person with the broth from the bottom of the dish spooned over them and the parsley scattered on top.
Variations
- Apple and sage: Fold half a peeled, finely diced apple into the filling for a sweeter version that suits a cold night.
- Greens in the mix: Wilt a few handfuls of chopped kale or swiss chard into the mushroom pan and mix it through the meat.
- Red onions: Large red onions bake the same way and turn a deep purple-brown, with a sharper flavor behind the sweetness.
- Herb swap: Trade the sage for a tablespoon of chopped rosemary when you want the filling to taste more of the woods than of the holidays.
- Broth to sauce: Pour the pan broth into a small saucepan after baking and boil it down by half for something glossy to pour over the tops.
Storage & Leftovers
Leftovers keep in a sealed container in the refrigerator for up to 4 days, and I would spoon the broth from the baking dish over them before the lid goes on. The onions keep absorbing it overnight, which makes the second day arguably better than the first.
Reheat them covered in a 350°F (175°C) oven for about 15 minutes, or take the faster route and chop a couple of halves roughly, filling and all, then fry them in a hot skillet until the edges brown. That version has more texture than the original and takes 6 minutes.
These freeze well, which is unusual for a stuffed vegetable. Cool them completely, wrap each half, and freeze for up to 3 months. Thaw overnight in the refrigerator and reheat covered with a splash of broth, since the shells give up some water on thawing and want it back.
Notes & Tips
- Buy the biggest onions you can find: Small onions give you a shell with room for almost nothing. You want them a good deal wider than a tennis ball so each half holds a real portion.
- Cut through the equator: Halving them the other way, through the root, gives you shells that will not stand up. Across the middle gives you two bowls.
- Brown the mushrooms properly: This is the only source of depth in the filling. If the pan still looks wet, keep going. Dark and dry is the target.
- Cool before you add the meat: Raw turkey mixed into a hot pan starts to cook and goes grainy. Give the skillet 5 minutes off the heat first.
- Pack the filling firmly: There is no egg holding this together, so pressure is the binder. Mound it and press it down with the back of a spoon.
- Do not skip the rest: Straight out of the oven the shells are slippery and want to slide apart. Ten minutes and they lift out whole.
Nutrition & Mindful Eating
- The onions, the mushrooms, and the turkey each carry a piece of this. The shells give it sweetness and bulk, the browned mushrooms give it the savory backbone, and the turkey tucked inside is where most of the protein on the plate comes from.
- Onions cooked this long turn sweet and silky, and the fiber they carry is the kind your gut bacteria feed on. Slow heat also makes them far gentler on a stomach that finds raw onion difficult, which is worth knowing if you usually skip them.
- Ground turkey is mild and fine-textured, and it takes on whatever it is cooked with, which is exactly what you want against sage and browned mushrooms. It brings selenium and B vitamins along with protein dense enough to hold you through the evening.
- Mushrooms browned until the pan is dry give the filling a meaty, almost roasted flavor, and they are one of the few foods that offer any vitamin D at all. They also add a soft chew that keeps the filling from packing down into a solid block.
- Dried sage, fresh thyme, and a tablespoon of cider vinegar do the work a sauce would otherwise do. The herbs go in with the garlic so the heat opens them up, and the vinegar goes in cold at the end so its sharpness survives the hour in the oven.
- As you eat, notice how little effort it takes to cut through an onion baked this long, and let the sweetness of it be a reason to sit down properly rather than eat standing at the stove.
Frequently Asked Questions
Can I use ground beef or pork here?
Yes to both. Beef makes it richer and darker, and pork makes it sweeter alongside the sage. Either one at the same weight bakes in the same time. Ground chicken works too, though it wants the mushrooms browned even harder to keep the filling from tasting flat.
My onion shells fell apart. What happened?
They were either simmered too long at the start or hollowed too thin. Eight minutes in the water is enough to soften them, and leaving 2 or 3 layers in the shell gives you a wall strong enough to lift with a spatula. A snug baking dish also props them up as they bake.
Can I put these together in advance?
The whole dish can be assembled, covered, and refrigerated a day ahead, which is how I usually do it. Add 10 minutes to the covered bake since it starts cold. The filling can also be made 2 days ahead on its own and kept separately.
Is this suitable for an AIP elimination phase?
It is. There is no breadcrumb, egg, cheese, or nightshade in the filling, and the binding comes from packing the meat and mushrooms tightly rather than from a starch. Onion and garlic are eaten in quantity here, so go by your own tolerance for alliums.