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8 ounces steak, chicken, or deli meat, sliced thin
3 ounces Fontina cheese, sliced (more if desired)
2 medium onions, sliced thin
2 tablespoons mayonnaise
4 slices good quality bread
1 tablespoon olive oil, plus extra to lightly oil the panini pan
1 tablespoon butter
salt and pepper
Heat a medium skillet over medium-low heat. Add the butter and 1 tablespoon olive oil. Add the sliced onions and cook slowly until caramel color. Salt to taste. Spoon caramelized onions into a small dish and set aside. Add the sliced steak to the skillet and saute to heat through. To assemble the panini, spread mayonnaise on one side of each slice of bread. Divide the onions, meat and cheese between the two sandwiches. Top with remaining bread. Heat a panini press or pan on medium-low and lightly grease with olive oil. Cook panini until bread is lightly browned and cheese is melted. Slice in half and serve immediately.
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