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1
Preheat oven to 375F.
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2
Mix vinegar, honey, brown sugar and thyme in medium bowl.
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3
Transfer 1/2 cup marinade to small bowl; set aside.
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4
Place mushrooms in 15x10-inch glass baking dish.
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5
Pour remaining marinade over mushrooms.
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6
Cover baking dish with foil and bake until mushrooms are tender, about 40 minutes.
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7
Transfer mushrooms to work surface; cool.
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8
Cut mushrooms into 1/2-inch-wide slices.
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9
Heat 2 tablespoons oil in heavy large skillet over medium heat.
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10
Add red onions and saute until very tender and beginning to brown, about 25 minutes.
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11
Pour in reserved 1/2 cup marinade and cook until liquid is absorbed and onions are glazed, about 6 minutes.
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12
Set onions aside.
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13
Char bell peppers over gas flame or in broiler until blackened on all sides.
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14
Enclose in paper bag and let stand 10 minutes.
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15
Peel, seed and chop peppers.
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16
Place peppers in medium bowl.
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17
Add green onion, basil, garlic and 1 tablespoon oil and toss to combine.
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18
(Mushrooms, onion mixture and bell pepper mixture can be prepared 1 day ahead.
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19
Cover separately and refrigerate.)
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20
Preheat oven to 375F.
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21
Place bread slices on baking sheet.
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22
Brush bread with additional olive oil.
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23
Bake until lightly toasted, about 10 minutes.
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24
Layer portobello mushroom slices, arugula, onions and then bell pepper mixture atop bread slices.
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25
Bake until heated through, about 3 minutes.
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26
Season to taste with salt and pepper.
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27
Drizzle bruschetta with Rosemary Aioli.
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28
Serve immediately.