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2 tablespoons unsalted butter

1/4 teaspoon caraway seeds

10 ounces cremini or white mushrooms, thinly sliced

Kosher salt and freshly ground pepper

3 medium carrots, quartered lengthwise and cut into 1-inch pieces

4 cups low-sodium chicken broth

1 small red onion, finely diced

1 tablespoon red wine vinegar

4 slices pumpernickel bread

1/3 cup sour cream or creme fraeche