1. Stir together first 6 ingredients and 1/4 cup cilantro in a medium bowl. Season with salt and pepper to taste. Let stand 10 minutes.
2. Stir together mayonnaise, sriracha, and remaining 1/4 cup cilantro. Spread buns with mayonnaise mixture. Top bottom halves of buns with bacon, tomatoes, and cabbage mixture. Cover with top halves of buns, mayonnaise mixture sides down.