INGREDIENTS
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2 12-ounce bottles lager beer
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1 large onion, cut into wedges
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4 cloves garlic, smashed
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1 2-inch piece ginger, thinly sliced
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1 teaspoon caraway seeds
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2 bay leaves
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2 whole cloves
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6 to 8 links fresh bratwurst (about 2 1/2 pounds)
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4 tablespoons unsalted butter
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6 to 8 sub rolls or Italian-bread segments
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Whole-grain mustard, for serving
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Assorted toppings, for serving (below)