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1
Build a fire for banked grilling in an outdoor grill.
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2
For a charcoal grill, let the coals burn until they are covered with white ash. Spread out the mound of coals into a bank, with one side about two coals deep, and the other side of the slope with a scattering of single coals.
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3
For a gas grill, preheat the grill on High.
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4
Leave one side on High and turn the other side to Low.
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5
In both cases, you will have two areas for cooking, one hot and the other cooler.
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6
To make the romesco, with the machine running, drop the garlic through the feed tube of a food processor fitted with the metal chopping blade to finely chop it.
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7
Add the almonds, red peppers, vinegar, paprika, and oregano.
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8
With the machine running, gradually add the oil, then season with the salt and pepper.
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9
Transfer the sauce to a bowl. (The romesco can be made up to 2 weeks ahead, covered and refrigerated. Bring to room temperature before serving.).
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10
Working as gently and quickly as possible (overmixing compacts the meat and makes tough burgers), mix the ground round, salt, and pepper.
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11
Lightly form into 4 patties about 4 inches wide.
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12
Make an indentation, about 2 inches wide and 1/2 inch deep, in the center of each burger to help it keep its shape during grilling.
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13
Lightly oil the cooking grate.
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14
Place the burgers on the hot area of the grill.
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15
Cover and cook, turning once, until the outside is seared with grill marks, about 2 minutes per side.
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16
Move the hamburgers to cooler side of the grill and cover.
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17
Cook, turning once, until the hamburgers feel somewhat firm but not resistant when pressed in the center, about 4 minutes for medium-rare.
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18
If using a meat thermometer, insert it horizontally through the side of the burger to reach the center --it should read 125u00b0F.
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19
During the last 2 minutes, top each burger with the cheese, and place the buns on the grill to toast lightly and warm through.
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20
Place a burger in each bun, top with a large dollop of romesco sauce, and serve immediately.