Start by taking your leftover beef brisket and dicing or shredding it into bite-sized pieces.
In a blender or food processor, combine the chipotle chiles in adobo sauce, beef broth, low sodium soy sauce, and cornstarch. Blend until smooth.
In a large skillet, heat the cooking oil over medium heat. Once hot, add the diced onions and sauté until translucent, about 5 minutes.
Add the diced or shredded brisket to the skillet with the onions. Pour the chipotle sauce over and stir well. Let simmer for 5-7 minutes.
While the brisket simmers, heat another skillet over medium heat and warm each corn tortilla for about 30 seconds on each side.
Take a warm tortilla and add a portion of the brisket mixture. Top with chopped cilantro, pico de gallo, crema, avocado, coleslaw, lettuce, and jalapenos.
Serve immediately while warm, optionally adding a squeeze of fresh lime over the top. Enjoy!