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1
Prepare a medium-hot fire in a charcoal grill with a cover, or preheat a gas grill to medium-high.
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2
To make the caramelized onions, combine the onion, pepper sauce, broth, vinegar, oil, garlic, and brown sugar in a 10-inch nonstick, fire-proof skillet, cover with a lid, and place on the grill rack.
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3
Cook the onion mixture for 15 to 20 minutes, stirring occasionally, until the onions are caramelized and most of the liquid is evaporated.
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4
Remove the pan from the grill and set aside.
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5
To make the spread, combine the cheeses in a fire-proof saucepan, cover, and set aside.
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6
To make the patties, combine the chuck, sirloin, onion, Zinfandel, herbs, pepper sauce, and seasoned salt in a large bowl.
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7
Handling the meat as little as possible to avoid compacting it, mix well.
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8
Divide the mixture into 6 equal portions and form the portions into patties to fit the rolls.
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9
When the grill is ready, brush the grill rack with vegetable oil.
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10
Place the patties on the rack, cover, and cook, turning once, until done to preference, 5 to 7 minutes on each side for medium.
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11
Meanwhile, place the saucepan with the cheese spread on the outer edge of the rack to warm the cheese mixture just until it reaches a very soft, spreading consistency.
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12
Remove the saucepan from the grill and set aside.
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13
During the final minutes of grilling the patties, brush the avocado slices with balsamic vinegar and sprinkle with seasoned salt.
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14
Arrange on a rimmed nonstick perforated grilling pan coated lightly with oil and grill alongside the patties for 1 to 2 minutes, turning as necessary.
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15
During the final 30 seconds, add the bacon slices to the pan.
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16
When the avocados are nicely grilled and the bacon is crisp, remove from the grill.
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17
When the patties are cooked, remove from the grill, stacking to keep warm.
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18
Place the rolls, cut side down, on the outer edges of the grill rack to toast lightly.
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19
To assemble the burgers, spread a generous amount of the cheese mixture over the cut sides of the rolls.
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20
On each roll bottom, place a lettuce leaf, a tomato slice, a patty, an equal portion of the caramelized onions, 2 avocado slices, and 2 bacon slices.
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21
Add the roll tops and serve.
