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Roast Beef Panini With Caramelized Onions And Horseradish Cheese Sauce

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Roast Beef Panini With Caramelized Onions And Horseradish Cheese Sauce

Ingredients

  • 1 gigantic or 2 medium onions, thinly sliced
  • 2 tbsp olive oil + extra for brushing the panini
  • 1/2 cup mayonnaise
  • 1/4 cup grated cheese (cheddar is great)
  • 2 tsp prepared horseradish
  • large pinch of fresh black pepper
  • 4 slices of bread
  • 8 slices of roast beef
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