Ingredients

• 1/2 tablespoon unsalted butter, softened, plus more for buttering bread
• 1/2 tablespoon extra virgin olive oil
• 1 medium onion, thinly sliced
• 4 slices whole wheat or sourdough bread
• 1 teaspoon fresh parsley, chopped
• 12 slices Swiss cheese, sliced very thin
• warm beef stock for dipping, if desired

Directions

• Add butter and oil to a medium frying pan.
• Add onions and cook over low-medium heat for 30 minutes. The onions should be a dark brown color.
• Butter each slice of bread. Place buttered side down in a large frying pan
• Add 3 extra thin slices of cheese on each side. (6 slices on each sandwich total).
• Place onions on one side of bread. When the cheese has melted put sandwiches together and take out of the pan.
• Cut in half and serve immediately with a side of hot beef broth if desired.