Supper with Stella

Ingredients

• 4 Tbsp. butter
• 2 Tbsp. olive oil
• 4 sweet onions, sliced lengthwise (top to bottom)
• 4 yellow onions, sliced lengthwise
• 2 Tbsp. Calvados
• 1 cup dry white wine, such as chardonnay
• 8 cups beef broth
• 1 Tbsp. Worcestershire
• 2 bay leaves
• a few springs of thyme
• Salt & pepper, to taste
• 1 cup Gruyere
• 4-6 slices crusty bread