1. Heat olive oil in heavy skillet. Add onions; cook over medium low heat 30 minute, stirring occasionally, until onions reduce and turn a caramel color.
2. Preheat indoor grill,panini or sandwich maker. Spread 1 tsp honey mustard on bottom half of each roll. Top evenly with caramelized onions and slice of Swiss cheese. Place remaining half of each roll atop onions and cheese.
3. Place sandwiches on grill; cover and cook 4 minutes, until cheeseis melted. Cool slightly; slice and serve.
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