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1
Mix first 6 ingredients in medium bowl.
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2
Place lamb in 15x10x2-inch glass baking dish.
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3
Pour marinade over.
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4
Turn lamb, spreading marinade to coat evenly on all sides.
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5
Cover dish with plastic wrap and refrigerate for 1 day, turning lamb occasionally.
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6
Whisk lemon juice, shallots, oil, parsley, and mint in medium bowl to blend.
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7
Season dressing with salt and pepper.
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8
Place zucchini, yellow squash, and red bell peppers in separate dishes.
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9
Sprinkle each lightly with salt and pepper.
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10
Spoon 1/3 cup dressing over each and turn to coat; reserve remaining dressing.
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11
Arrange red onions in large glass dish; sprinkle with salt and pepper.
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12
Pour wine over onions.
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13
Let vegetables and onions marinate at least 2 hours and up to 4 hours, basting or turning occasionally.
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14
Spray grill rack with nonstick spray and prepare barbecue (medium-high heat).
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15
Grill vegetables in batches until just tender, turning occasionally, about 15 minutes for onions, 10 minutes for red bell peppers, and 8 minutes for zucchini and yellow squash.
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16
Transfer vegetables to baking sheets.
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17
Reserve red Zinfandel from onions to baste lamb.
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18
Place butterflied lamb on grill rack with some rosemary and thyme marinade still clinging to lamb.
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19
Grill until meat thermometer inserted into center registers 130F for medium-rare, turning occasionally and basting with reserved red Zinfandel from onions, about 35 minutes.
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20
Transfer lamb to work surface; let rest 15 minutes.
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21
Starting at 1 corner and positioning knife at slight angle, slice lamb thinly across grain.
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22
Arrange lamb slices on large platter.
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23
Arrange grilled vegetables around lamb.
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24
Drizzle vegetables with reserved lemon-herb dressing.
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25
Sprinkle with feta cheese.
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26
Garnish with fresh rosemary, thyme, and mint sprigs.