Seared Skate with Baby Root Vegetables and Sauce Grenobloise

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8 small red beets with tops

8 small golden beets with tops

Salt

8 small white turnips with tops

2 pounds spinach, cleaned, stems removed (can use 1 pound if beet and turnip greens are in good quality)

8 new potatoes

1/2 cup olive oil, divided plus 2 tablespoons

1 tablespoon fresh thyme, roughly chopped

Freshly ground black pepper

2 large skate wings, skinned and filleted

2 cups Wondra flour

1/4 pound unsalted butter

3 lemons, 1 segmented and 2 juiced

3/4 cup demi-glace (chicken or veal)

4 slices white bread (not Wonder), cut into 1/2-inch cubes and toasted

2 tablespoons flat-leafed parsley, roughly chopped

2 tablespoons capers (non-pareil), drained