6 large onions (3 lbs), sliced thin 4 Tbsp olive oil Cook until soft 2 Tbsp butter More oil Cook until brown 1 tsp sugar Pinch salt Sprinkle, cook until very brown 2 garlic Splash red wine vinegar to deglaze 8 cups beef broth 2 bay leaves Few sprigs fresh thyme Simmer 30 minutes 1" thick bread slices Brush with oil, toast in oven Swiss cheese, grated Sprinkle, toast more Serve cheese bread in bowl with soup