Quick Meatball Banh Mi Sandwich

Combine vinegar, honey, and salt in a medium bowl. Add cucumber and carrot; let stand at room temperature for 20 minutes or refrigerate for up to 24 hours. Drain off the marinade.

Combine mayonnaise and Sriracha in a small bowl.

Place meatballs in a microwave-safe bowl; cover and microwave on High until just warmed, about 2 minutes.

Spread half of the mayonnaise mixture on each roll. Divide the meatballs and the vegetables between the rolls. Sprinkle with cilantro.