This whole chicken roasts with rosemary, garlic, and lemon, then finishes with a silky, low-carb gravy made in your blender—no flour or whisking required.
Stuff the chicken: Place 2-3 onions quartered onion, 1 clove of garlic, 1 lemon quartered, and 5 sprigs of5 sprigs fresh rosemary inside the cavity of 1 whole chicken.
Season the outside: Tie the legs if desired, then rub with 1½ tablespoons olive oil. Sprinkle with 1 teaspoon table or sea salt and ¼ teaspoon freshly ground pepper, and squeeze lemon juice over the top.
Start roasting: Scatter remaining onions and garlic in a 13×9-inch roasting pan. Toss with the remaining oil. Place the chicken breast-side down on top and roast for 30 minutes.
Flip and finish roasting: Turn the chicken breast-side up, add ½ cup broth, and continue roasting until the thickest part of the thigh reaches 180˚F. For larger birds (6–7 lbs), lower oven to 375˚F (190˚C) after 90 minutes.
Rest the chicken: Transfer to a platter, tent loosely with foil, and let rest.
Blend the gravy: Combine roasted onions, garlic, pan juices, and remaining broth in a blender or with an immersion blender until smooth. Taste and adjust seasoning; add a squeeze of lemon if desired.
Notes
Storage: Both the broth and the chicken freeze well. Store in airtight containers for up to 3 months. Thaw in the fridge and reheat gently.