Caramelized Onion Cream Soup with butter

4 yellow onions , sliced very thin 3 tablespoons butter 2 tablespoons olive oil 2 teaspoons sugar 1/4 teaspoon salt 1/4 teaspoon black pepper 8 ounces cream[...]

2 tablespoons unsalted butter 4 large onions , peeled and chopped 2 garlic cloves , chopped 1 cup white wine 2 tablespoons sherry wine 4 cups chicken stock,[...]