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Fill a large saucepan with water and bring it to a boil over high heat.
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Wash and trim the beans.
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Add the beans to the boiling water and blanch for 3 to 4 minutes, until the beans are pliable but still crunchy.
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Drain the beans and run them under cold water. Pat dry with paper towels or a clean dish towel and place them in a shallow ovenproof casserole.
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In a medium saucepan, melt the butter over medium heat.
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Stir in the dry mustard, brown sugar, garlic and salt.
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Pour the butter mixture over the green beans, cover and refrigerate for at least 4 hours or overnight.
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Preheat the oven to 375 degrees.
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Make a bundle of 8 or 9 beans, wrap half a bacon slice around each bundle, securing with a toothpick, and arrange in a single layer in the same casserole used for marinating.
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Bake, uncovered, for 45 minutes or until the bacon is cooked and the beans look wrinkled.