Rub the garlic salt, paprika, sugar and some seasoning into the flesh of the salmon fillet. Heat grill to high.
Mix the yogurt, chipotle paste or hot sauce and lime juice together in a bowl with some seasoning, and set aside. Place the salmon on a baking tray lined with foil and grill, skin-side down, for 7-8 mins until cooked through. Remove from the grill and carefully peel off and discard the skin.
Flake the salmon into large chunks and serve with the warmed tortillas, chipotle yogurt, shredded cabbage, coriander, jalapeÃ±os and lime wedges. Add a shake of hot sauce, if you like it spicy.