How to Make It
Halve baby zucchini and small radishes lengthwise. Place, cut sides down, on a rimmed baking sheet. Lightly coat with cooking spray. Broil on high on oven rack in top position until browned and tender, 4 to 5 minutes.
Whisk together olive oil, fresh lemon juice, Dijon mustard, kosher salt, and black pepper in a small bowl. Arrange mixture on a platter. Drizzle with dressing, and sprinkle with fresh thyme leaves.