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1
Lay a chicken breast on parchment paper.
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2
Starting on 1 long side, cut horizontally into breast but not completely through.
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3
Open cut breast like a book.
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4
Top with another sheet of parchment.
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5
Flatten to an even thickness, about 1/3 inch thick.
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6
Repeat with remaining breasts.
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7
Rub both sides of each breast with garlic; transfer chicken and garlic to a large resealable plastic bag.
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8
Squeeze 2 lemon halves over chicken; add rinds to bag.
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9
Thinly slice remaining lemon halves crosswise.
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10
Top each breast with a lemon slice and thyme sprig; season with pepper.
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11
Drizzle chicken with oil.
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12
Marinate in the refrigerator, flipping occasionally, at least 2 hours (up to overnight).
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13
Preheat a grill or grill pan to high.
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14
Discard marinade, lemon, and thyme.
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15
Season chicken with salt and pepper.
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16
Grill, flipping once, until cooked through, 2 minutes per side.
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17
Serve chicken warm, at room temperature, or cold.
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18
Top each breast with salad, dividing evenly; serve with lemon wedges.
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19
Whisk lemon juice, salt, and pepper in a small bowl.
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20
Gradually add oil, whisking constantly until emulsified
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21
To serve, toss arugula, radicchio, mache, and tomatoes in a large, chilled bowl with just enough dressing to lightly coat.