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1
Heat the grill to high; lightly oil the grates.
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2
In separate piles, arrange the zucchini, mushrooms, and scallions on a baking sheet.
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3
Drizzle with 2 tablespoons of the oil; season with salt and pepper.
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4
Working in batches if necessary, remove each pile of vegetables from the baking sheet.
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5
Grill, turning once, until lightly browned and tender, 2 minutes for scallions, 6 minutes for mushrooms, and 8 minutes for zucchini.
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6
Return all the vegetables to the baking sheet.
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7
Slice the mushrooms into 1/2-inch-wide strips.
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8
Set aside.
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9
Brush the tortillas with the remaining tablespoon oil; grill, turning frequently, until browned and very crispy, about 2 minutes.
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10
Place 1 tortilla on each serving plate; cover evenly with mushrooms and zucchini.
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11
Using kitchen shears, snip scallions over the vegetables.
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12
Top with the salsa, and sprinkle with the feta; serve with lime wedges, if desired.
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13
Chop the tomatoes into 1/4-inch pieces; transfer to a medium bowl.
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14
Add the onion, chile, garlic, cilantro, and lime juice; season generously with salt.
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15
Mix to combine.
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16
Let stand 15 minutes to develop flavor.
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17
Salsa can be kept at room temperature up to 2 hours.
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18
To store, transfer to an airtight container, and refrigerate up to 3 days.