1In a large non-stick saucepan, heat 1/4 cup vegetable broth. Stir in the onion and cook over medium heat until golden, 15 minutes.
2Stir in the sugar and flour. Pour in the remaining 5 cups vegetable broth and the wine. Stir in the bay leaf, thyme and black pepper. Bring to a boil and let boil 8 minutes, stirring constantly; then reduce heat, partly cover, and simmer 30 minutes.