French onion soup | Something New For Dinner

Ingredients

• 2 1/2 pounds yellow onions, sliced
• 1 T olive oil
• 2 T butter
• 2 cloves garlic (optional)
• 1 pinch salt
• 1 sprig thyme
• 1 pinch sugar (optional)
• 1/2 cup red or white wine
• 3 cups chicken stock
• 2 cups beef stock
• 1 t dijon mustard
• 1 T balsamic vinegar (optional)
• 1/2 t Worcestershire sauce (optional)
• Salt and pepper
• 4 slices French bread
• 1 cup grated gruyere cheese
• 1/2 cup grated parmesan cheese