FONDUE

6 teaspoons unsalted butter 1 onion, very finely chopped 2 teaspoons all-purpose flour 2/3 cup sour cream 2 cups grated Gruyère 2 cups grated Cheddar 2 Tablespoons chopped, fresh chives freshly ground black pepper Serve with: small cooked sausages, cooked fingerling potatoes, use your imagination. 1. Melt the butter over low heat in a saucepan…