Za’atar adds so much flavor to this tartine you could easily skip the cheese.
1. Preheat oven to broil. Toss together tomatoes, arugula, and shallot in large bowl. Add oil, lemon juice, and 1 tsp. Za’atar; toss to coat. Set aside.
2. Spread chèvre on bread slices, and place on baking sheet. Sprinkle each bread slice with 1 tsp. Za’atar. Broil 2 to 3 minutes, or until bread is crisp and Za’atar darkens.
3. Place 2 bread slices on each plate. Top each with 1/4 cup tomato-arugula mixture.