INGREDIENTS
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2 tablespoons olive oil, plus more for baking sheet
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2 tablespoons plus 1 teaspoon honey mustard
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2 tablespoons ketchup
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1 pound ground beef chuck
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1 large egg, lightly beaten
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1/2 cup panko (Japanese breadcrumbs)
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1 cup shredded white cheddar (about 4 ounces)
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Coarse salt and ground pepper
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1 pound white new potatoes, scrubbed and quartered
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1 tablespoon red-wine vinegar
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1 head Boston lettuce, torn into bite-size pieces