Sheboygan-Style Beer-Soaked "Brats"

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   ["In a large deep heavy skillet stir together beer, mustard, and ketchup.", "Cut 1 onion into thick slices and add to beer mixture.", "Bring beer mixture to a boil and in it simmer bratwursts, uncovered, turning occasionally, 20 minutes.", "Prepare gill.", "Remove bratwursts from beer mixture, discarding beer mixture.", "Cut remaining 3 onions into thick slices, keeping slices intact.", "Grill bratwursts with onion slices on an oiled rack set 5 to 6 inches over glowing coals, turning onions once, until bratwursts are cooked through and golden brown and onions are cooked through, about 5 minutes.", "Put a pair of ""brats,"" cut in half lengthwise and stacked, on each roll.", "Top brats with grilled onion, pickles, and mustard."]

* Per serving · 4 servings · Values may vary.