Step 1

Trim and discard big fat pads from the chicken thighs. If the thighs are large and/or super uneven in thickness, butterfly them. Set aside.

Step 2

In a bowl, stir together the sugar, salt, pepper, fish sauce, and lime juice. If needed, tweak the flavor to get a slightly tart-sweet, salty finish. Add the oil, then the chicken, coating the pieces well. Cover with plastic wrap and marinate at room temperature for 30 minutes

Step 3

To grill the chicken, preheat a gas grill to medium or prepare a medium-hot fire, or use a stove-top grill pan heated over medium-high heat with a little oil brushed on. Cook the chicken for 6 to 10 minutes, turning several times, until clear juices flow out when you pierce the flesh with the tip of a knife. Cool for 10 minutes before cutting across the grain. Tumble in the cooking juices to include extra flavor in the sandwich.

Step 4

Cut each sandwich roll halfway open, and divide the mayonnaise among the rolls, spreading it to cover each exposed side of the bread. Sprinkle Maggi seasoning across the surface and divide the vegetables and chicken among the sandwiches.