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1
Preheat the oven to 400.
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2
Using a French-fry cutter or sharp knife, cut each potato lengthwise into long strips about 1/2-inch thick.
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3
Toss with the 2 tablespoons oil and spread in a single layer on a large baking sheet.
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4
Bake, occasionally scraping up the potatoes with a metal spatula, until the fries are golden brown, about 1 hour; transfer to paper towels to drain.
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5
Just before the fries are done, lightly oil the bottom of a large cast-iron frying pan.
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6
Place the pan over med-high heat and heat until very hot.
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7
While the pan is heating, in a bowl, using clean hands, lightly mix together the ground beef, 1 tsp salt, and 1/2 tsp pepper.
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8
Handling the seasoned beef as little as possible, form into 4 plump patties, each about 4 inches in diameter.
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9
Place the burgers in the hot frying pan.
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10
Cook until browned on the first side, about 3 minutes.
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11
Turn and cook until browned on the second side, about 3 minutes longer for medium burgers.
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12
While the burgers are cooking, toast the buns in a toaster or under a broiler, cut side up, for about 1 minute.
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13
Season the hot oven fries to taste with salt and pepper.
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14
Place each burger on a bun.
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15
Serve at once, with the fries.
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16
Pass the ketchup, mayonnaise, mustard, tomatoes, lettuce, and onion at the table.
