Fantastic! Always get requests for this recipe. I double or triple this recipe for a crowd, making little sandwiches from homemade dinner rolls. I place them all on a large baking sheet and cover the baking sheet with foil instead of wrapping them individually. I'm not a big fan of grocery store Swiss, so I often used other cheeses such as Fontina, Cheddar, Gruyere, American, etc.). Oh, if you prefer to use fresh minced onion, just cook the butter, mustard, onions, and poppy seeds for a couple of minutes in a small saucepan - then proceed with the recipe as written.
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