Step 1

Preheat a grill to medium-high.

Step 2

Combine oil, za'atar and lemon zest in a small bowl. Brush 1 side of eggplant slices with half of the oil mixture; reserve the remaining mixture. Oil the grill rack (see Tips). Grill the eggplant, uncovered, turning often, until tender and grill marks appear on both sides, about 5 minutes total. Cut the eggplant into 1/4-inch pieces and transfer to a large bowl.

Step 3

Coat bell pepper quarters and onion wedges with cooking spray. Grill, uncovered, until tender and charred, about 5 minutes. Chop the peppers into 3/4-inch pieces. Remove and discard onion stem. Add the peppers, onions, tomatoes, parsley, scallions and mint to the bowl with the eggplant.

Step 4

Add lemon juice and salt to the reserved oil mixture; whisk to combine. Drizzle over the vegetables and toss to coat.