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1
Place the orange juice, measured oil, vinegar, garlic, salt, orange zest, and red pepper flakes in a large, nonreactive bowl and whisk to combine.
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2
Add the bell peppers and eggplant and toss to coat.
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3
Let sit at room temperature while the grill heats, at least 5 minutes.
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4
Heat a gas or charcoal grill to medium (about 350 degrees F to 450 degrees F) or a grill pan over high heat and rub the grill or grill pan with a towel dipped in olive oil.
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5
Remove the eggplant from the marinade and place on the grill; cook until soft and lightly charred on one side, about 5 minutes.
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6
Flip and cook until charred and soft on the other side, about 5 minutes more.
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7
Remove to a plate and set aside.
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8
Place the peppers on the grill and cook until soft and lightly charred on one side, about 5 minutes.
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9
Flip and cook until charred and soft on the other side, about 5 minutes more.
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10
Remove to the plate with the eggplant and set aside.
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11
Place the crumbled cheese on the bottom piece of bread, then evenly distribute the spinach over the cheese.
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12
Drizzle the marinade over the spinach, then layer the grilled vegetables over the spinach.
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13
Close the sandwich and wrap in aluminum foil.
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14
Place on a flat surface, cover with a baking sheet, and place heavy cans or a cast iron skillet on top of the baking sheet to press the sandwich down.
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15
Flip the sandwich after 10 minutes and press it down for another 10 minutes.
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16
Then unwrap, slice, and serve.