INGREDIENTS
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For the marinade:
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3 to 4 canned chipotle chiles with adobo sauce
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3 cloves garlic, finely minced
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1 small onion, chopped (about 1/2 cup)
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2 tablespoons balsamic vinegar, or more to taste
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1/2 cup vegetable oil
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Coarse salt and freshly ground black pepper to taste
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4 portobello mushroom caps, wiped clean with a dampened paper towel
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1 large sweet onion, cut crosswise into slices, then skewered
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1/2 cup salted butter, melted
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2 poblano chiles
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For serving:
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4 individual ciabatta rolls, or other rustic roll, sliced in half
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4 slices pepper Jack cheese
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2 ripe avocadoes, pitted and sliced