"For these burgers, Martha loves Milton Creamery's Prairie Breeze cheddar and Challerhocker Swiss, both available at Murray's Cheese. Grate the horseradish and add it to the cheeses right before grilling; it quickly loses its potency once grated...."
INGREDIENTS
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1 1/2 cups coarsely grated aged cheddar (4 1/2 ounces)
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1 1/2 cups coarsely grated aged Swiss (5 ounces)
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5 teaspoons freshly grated horseradish, or prepared horseradish to taste
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3 pounds grass-fed ground beef chuck (85 percent lean)
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Coarse salt and freshly ground pepper
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Safflower oil, for brushing
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1/2 cup mayonnaise
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3 tablespoons ketchup
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8 brioche buns, split
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4 tablespoons unsalted butter, melted
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8 slices (1/4-inch-thick) large, ripe red tomato
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16 slices crisp-cooked bacon (1 pound)
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8 small lettuce leaves
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Bread-and-butter pickle slices