Preheat your oven to 350°F (175°C).
In a small bowl, mix together salt, cumin, smoked paprika, garlic powder, onion powder, and black pepper to create the seasoning rub for the pork belly.
Pat the pork belly dry with paper towels, then evenly coat it with the seasoning rub.
Place the seasoned pork belly on a rack in a roasting pan and roast in the preheated oven for 1 hour and 30 minutes, or until the pork belly is tender and the exterior is crispy.
While the pork belly is roasting, prepare the avocado salsa by combining diced avocados, red onion, cilantro, jalapeño, and lime juice in a bowl. Season with salt and gently toss to mix. Set aside to let the flavors meld.
Once the pork belly is done, remove it from the oven and let it rest for 10 minutes. Then, cut it into bite-sized pieces.
Assemble the tacos by placing a portion of the crispy pork belly into each lettuce leaf or keto-friendly tortilla.
Top with a generous spoonful of avocado salsa and any additional garnishes you desire.
Serve immediately and enjoy your Keto Pork Belly Tacos with Avocado Salsa!