Prepare the slaw:
In a large mixing bowl, combine shredded purple cabbage, mayonnaise, sour cream, lime juice, salt, and black pepper.
Mix well until cabbage is evenly coated.
Refrigerate while you prepare the salmon.
Make the chipotle cream:
In a small bowl, whisk together sour cream, adobo sauce, and salt until smooth.
Set aside.
Cook the salmon:
Pat salmon fillets dry with paper towels.
In a small bowl, mix together blackened seasoning and salt.
Rub both sides of each salmon fillet with olive oil, then generously coat with the seasoning mixture.
Heat a large skillet (preferably cast iron) over medium-high heat until very hot.
Add salmon fillets to the skillet and cook for 3-4 minutes per side, until charred and cooked through.
Remove from heat and let rest for 2 minutes.
Assemble the tacos:
Warm the corn tortillas in a dry skillet or over an open flame for a few seconds on each side.
Divide the blackened salmon among the tortillas.
Top each taco with a generous amount of purple cabbage slaw.
Drizzle with chipotle cream.
Garnish with chopped cilantro and a lime wedge.