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1 large onion, thinly sliced 8 oz white mushrooms, diced 2 tablespoons olive oil 8 slices caraway seeded rye bread 8 deli slices havarti or gouda cheese 2-4 tablespoons butter


  • Heat a large skillet over a medium-high flame. Add olive oil and heat.
  • Add onions and cook, stirring often, until translucent.
  • Add mushrooms and continue sauteing until onions have caramelized and mushrooms have cooked through. Transfer to a plate to cool slightly.
  • To assemble sandwiches, layer the mushroom mixture with the cheese between two slices of bread.
  • Return skillet to stove over a medium flame and melt 1 tablespoon of butter.
  • Place 2 sandwiches in the pan and fry a few minutes on each side, until the bread browns and cheese has melted. Add butter to pan in between sandwiches as needed. Serve hot.