Preheat oven 325'.
In Dutch oven heat oil and butter. Season meat all over with salt and pepper and add to pot. Brown turkey on all sides, 8 min.,. Set on plate.
Add onions to pot, cook stirring til soft. Add garlic for 30 seconds. Add broth, juice and rosemary , bring to boil. Return turkey to pot, cover and bake 30 min in oven.
Stir in squash, coating well with juices., cover and bake 30-45 min to read 160'.
Set turkey on carving board and tent loosely. Transfer squash to bowl and cover.
In small bowl, stir tog. cornstarch and 1 T. cold water til dissolved. Add to Dutch oven and boil til thick.
Season with s & p.
Slice turkey and arrange squash on each side.
Drizzle gravy over turkey and serve.
Sage may be used for rosemary.
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