Preheat oven to 325 degrees F. In a large heavy cast iron pot heat the oliveoil over medium high heat. In a large bowl add the oxtails, koshersalt, cumin, garlicpowder, chilipowder, and cayennepepper and toss to coat. Working in batches, add the oxtails to the hot pot and sear on all sides. Remove to the bowl while you continue with the remainder of the oxtails, removing to bowl after seared.
Add the onions to the pot and cook until translucent, about 5 minutes, scraping up the browned bits on the bottom. Add the garlic and stir for 30 seconds. Add the canned tomatoes, cinnamonsticks, redchile,and return the oxtails to the pot. Cover with the lid and place in the oven for 2 hours, turning the oxtails after 1 hour.
Remove from the oven and allow to cool in the pot for about 30 minutes while you prepare the taco shells. When cool enough to handle, shred the oxtail meat into a bowl.
In a medium skillet over medium high heat coated with cooking spray, add the corn. Cook stirring occasionally for about 5-7 minutes or until the corn starts to get a roasted color. Add the blackbeans, jalapeño, garlic, chilipowder and cumin and stir to combine. Pour into a serving bowl and add the cilantro and salt and pepper to taste. Stir to combine. Set aside.
Wonton Taco Shells
Preheat the oven to 400 degrees F. Using a 13x9 baking dish, coat the outside and inside edges with cookingspray. Drape the wontonwrappers over the edges, not overlapping. Place in the oven and bake for 5-7 minutes, or until lightly golden brown. Remove and repeat with remaining wrappers. Set aside to cool.
Sriracha Sauce
In a small bowl add the sourcream and sriracha and stir to combine. Crumble the quesofresco.
Assembly
Add about a tablespoon or so of oxtail to the wonton shells, top with the cornandblackbeanrelish, and a sprinkling of quesofresco. Repeat with the remaining wonton shells. Serve warm with the sriracha dipping sauce.