Roasted Chicken Banh Mi

Combine water, vinegar and sugar in a small saucepan. Bring to a boil over high heat. Add carrots and cucumber; cook for 1 minute. Let cool completely, about 30 minutes. Drain.

Mix mayonnaise, lime juice, fish sauce and pepper in a small bowl. Refrigerate until ready to use.

Split baguette portions horizontally. Hollow out the tops and bottoms, leaving a 1/2-inch border. Spread the mayonnaise mixture on the top halves. Layer chicken, the carrot mixture and cilantro on the bottom halves. Top with jalapeño, if desired.