Roasted Carrots and Cherry Tomatoes with Carrot Top Pesto Dressing

Name: Roasted Carrots and Cherry Tomatoes with Carrot Top Pesto Dressing
Ingredients: 1 clove garlic; 2 packed cups carrot top leaves and tender stems, plus 8 to 12 large sprigs for garnish; 1/2 cup packed cilantro sprigs or parsley leaves; 1/3 cup plus 1 Tbs. coarsely chopped toasted walnuts, divided; 1/2 cup coarsely grated Parmesan cheese; 11/2 tsp. white balsamic vinegar, divided; 1/3 cup plus 1 Tbs. olive oil, divided; 1 lb. carrots, trimmed and cut lengthwise into sticks; 12 oz. large cherry tomatoes, halved; 1 medium red onion, cut into wedges; 2 Tbs. olive oil