In a medium bowl, stir together the vinegar, sugar, and salt. Add the cucumber, carrot, and radish sticks, then let it sit at room temperature for at least 10 minutes.
⅓ cup rice vinegar, 1 tablespoon sugar, 1 teaspoon kosher salt, ½ English cucumber, 2 medium carrots, ½ Daikon radish
In a separate medium bowl, combine the ground chicken, scallions, ginger, garlic, soy sauce, lime juice, and brown sugar. Shape into 4 patties, place on a cookie sheet or plate, and freeze for 10 minutes.
1 pound ground chicken, 1 scallion, 1 teaspoon ginger, ½ teaspoon garlic, 1 tablespoon low-sodium soy sauce, juice from ½ of a lime, 1 tablespoon light brown sugar
Grill the burgers for about 5 minutes per side or until they are cooked to an internal temperature of 165°F. Alternatively, you can use a broiler.
Spread some sriracha mayonnaise, if using, on 4 large lettuce leaves. Top each with a burger.
lettuce leaves, sriracha mayonnaise
Drain the vegetables and top each chicken burger.
thinly sliced jalapeños