Brown the ground beef in a large skillet over medium-high heat. Drain any excess fat.
Stir in the taco seasoning, water, cheese, marinade and hot sauce. Keep stirring until the mixture reaches a boil, then reduce the heat to a simmer. Continue simmering for 10 minutes, stirring often.
Remove from heat and cover to keep warm.
In a separate skillet, heat the oil over medium high heat and add onion, bell pepper, jalapeno and mango. Sprinkle with the salt and sugar.
Cook until the vegetables are well caramelized, stirring often, about 15 minutes.
For the sauce
Combine the salsa verde and mayonnaise and mix well.
For the sandwiches
Toast the buns as desired. Slather with the sauce and top with the meat mixture. Serve.