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Preheat oven to 400 degrees. Cut six 4-by-4 squares from puff pastry sheets. Place squared on a sheet pan and bake until golden brown, about 12-15 minutes. Set aside. Melt butter in a heavy medium saucepan over medium heat. Add onions and saute until they begin to caramelize, 7-8 minutes. Add mushrooms and saute until tender. Stir in wine, cream, mustard and vinegar. Reduce heat to low and gently simmer, stirring occasionally, until the sauce thickens, about 10 minutes. Season to taste with salt and pepper. Remove from heat. Cut each scallop in half horizontally, making 2 thinner rounds. Heat olive oil in a large pan over medium-high heat. Add scallops and cook for 1 minute per side.
To assemble each tower, carefully cut a puff pastry square into 3 layers. Place a few arugula leaves on the bottom portion and top with 2 scallop slices and 2-3 tablespoonfuls of mushroom sauce Repeat with the middle layer of pastry, arugula, scallops and sauce. Cap with the top pastry piece.