Cold Sesame Noodles with Summer Vegetables

Name: Cold Sesame Noodles with Summer Vegetables
Ingredients: 1 /3 cup unseasoned rice vinegar; 1 /3 cup vegetable oil; 1 tablespoon Sriracha (hot chili sauce); 1 tablespoon toasted sesame oil; 8 cups matchstick-size pieces mixed summer vegetables (such as carrots, radishes, cucumbers, and bell peppers; about 1 1/4 pounds); Kosher salt, freshly ground pepper; 8 ounces buckwheat soba (Japanese-style noodles) or vermicelli noodles; 1 cup (loosely packed) cilantro leaves with tender stems; 3 scallions, thinly sliced; 1 tablespoon black or white sesame seeds