Preheat pellet grill or smoker to 225°F with your choice of wood or pellets.
Prep the brisket point - Pat the brisket point dry with paper towels and lightly trim, removing only obvious hard fat chunks and silver skin. Season all sides generously with black pepper, then kosher salt, then Mexican seasoning blend.
Smoke the brisket - Place the brisket fat-side up on the smoker or pellet grill. Smoke at 225℉ for 1 hour, then increase the grill temperature to 250℉. Continue smoking until internal temperature reaches 160-165°F (approximately 5 hours total). Remove from the smoker and let rest for 15-20 minutes.
Make the Birria sauce - While brisket smokes, heat a dry skillet over medium heat. Toast the dried peppers for about 2 minutes per side, flipping regularly until fragrant (do not char). Remove the pan from the heat, add enough water to cover the peppers, and soak for about 15 minutes.
Add the rehydrated peppers to a blender along with fire-roasted tomatoes, beef consommé, chipotle peppers in adobo, garlic, onions, jalapeño, lime juice, cilantro, Roma tomatoes, and white vinegar.
Blend on high until completely smooth, about 1-2 minutes. Taste and adjust seasoning if needed. *If sauce is too spicy, add more tomato. Or for a spicier sauce, add more chipotles in adobo.
Cut and braise the brisket burnt ends - Once the brisket has rested, cut into 1-2 inch cubes. Add the brisket chunks to a large aluminum foil pan in a single layer, along with any juices from the cutting board. Pour the birria sauce over the meat, ensuring all pieces are covered.
Place uncovered pan back on the smoker at 250-275°F. Smoke until burnt ends reach an internal temp of about 203-205℉ and meat is fall-apart tender.
Remove pan from smoker and let cool about 15-20 minutes. Then shred or break apart the birria-style burnt ends for tacos.
Assemble the burnt end tacos - Warm corn tortillas on a griddle or directly on grill grates. Add a generous scoop of burnt ends to each tortilla. Top with diced onion, cilantro, Crema, or your favorite toppings. Sprinkle with crumbled Cotija cheese. Serve immediately.