Season the fish with cumin, smoked paprika, coriander, salt and pepper. In a food processor, purée chipotle in adobo with lime zest and juice, honey or light agave, oil, garlic and ginger. Pour over fish to coat.
Preheat grill, griddle or cast-iron skillet over medium-high heat.
For slaw, whisk up tequila, lime juice, vinegar, honey or agave or sugar, oil, salt, pepper and celery seed. Combine cabbage, onions and cilantro or parsley in a mixing bowl then pour dressing over and toss to coat.
Rinse out processor and add crema or sour cream, avocado, lime juice, salt and cumin; process until smooth.
Spray grill, griddle or skillet with cooking spray and cook fish to opaque and browned, about 6-7 minutes, occasionally turning gently with a fish spatula.
Char tortillas over open flame, on grill or in dry skillet over high heat. Break fish into chunks. Assemble tacos with fish, slaw, crema and toppings of choice.