Recipe: Sweet Potato, Carrot and Cheddar Soup with Pickled Shallots

-2 tablespoons butter

-1 yellow onion, diced

-3 cups carrots, diced

-1 cup wine

-4 cups sweet potato, peeled and diced

-4 cups broth

-½ cup cream

-4 ounces sharp cheddar

-kosher salt

Pickled Shallots

-2 shallots, thinly sliced

-½ cup rice wine vinegar

-2 Tablespoons sugar

-1 teaspoon kosher salt