1. In a small stock pot, add corn and cover with water. Cook over high heat until the water comes to a boil. Turn off heat and allow corn to sit in it for 3-5 minutes.
2. Meanwhile, add shredded beef to a large bowl.. Add the black beans. Generously sprinkle with taco seasoning to taste.
3. Place corn into bowl with beef/bean mixture, and combine well.
4. Warm the tortilla to make it pliable and prevent cracks. Place each tortilla in a dry pan over medium heat.
5. Rotate tortilla until it is no longer stiff, then stuff it right away while it's still warm.
6. Lay tortillas on the countertop, and scoop the beef/bean/corn mixture onto the center of the tortilla in a strip. Top each with salsa.
7. To roll: First fold bottom edge of the tortilla up and over the filling. While holding the bottom of the tortilla over the filling, fold in the sides.
8. Then, starting from the folded bottom edge, roll up the tortilla to encase the filling.
9. Serve burritos with guacamole.