Root Vegetable Potage with Spiced Créme Fraiche and Honey-Crisped Walnuts

Serves 4 to 6
INGREDIENTS
1 tablespoon extra-virgin olive oil
1 tablespoon unsalted butter
1 pound onions, roughly chopped (about 4 cups)
4 to 6 peeled garlic cloves
2 tablespoons finely chopped fresh ginger
Sea salt or kosher salt
2 pounds assorted winter root vegetables, such as rutabaga, carrot, parsnip, turnip, celery root, and sunchokes, peeled and roughly chopped (about 8 cups)
2 teaspoons [...]

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