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1
Arrange 1 rack in the top third of the oven and another in the bottom third.
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2
Heat the oven to 400 degrees F.
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3
Mince 1 clove of garlic and add to a medium bowl, along with the zucchini, yellow squash, eggplant, and onion.
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4
Add the olive oil, season with salt and pepper, and mix to combine.
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5
Spread the vegetable mixture on the 2 sheet pans, using a spatula to distribute it evenly.
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6
Roast for 10 minutes, then remove the pans and stir the vegetables to make sure they cook evenly.
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7
Return to the oven until the vegetables are lightly browned, about 5 minutes more.
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8
Remove the pans from the oven and reduce the heat to 350 degrees F. Transfer the vegetables to a large bowl and immediately add the tomatoes; stir to combine.
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9
Cool to room temperature, about 1 hour.
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10
Add the lemon zest and basil chiffonade to the cooled veggie mixture.
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11
Season with salt, pepper, and lemon juice to taste.
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12
Meanwhile, add the baguette slices to a large bowl and add enough olive oil to coat each slice.
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13
Season with salt and pepper and toss.
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14
Arrange the slices in a single layer on a sheet pan and bake until golden brown, about 12 minutes.
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15
Remove from the oven and, while the toasts are still hot, lightly brush one side of each slice with the remaining garlic cloves.
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16
To serve, place a heaping tablespoon of the vegetable mixture on each baguette slice.
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17
Lightly drizzle with balsamic vinegar and top with a few shavings of Pecorino Romano.
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18
Garnish with small basil leaves.