Add prepared green cabbage to medium bowl.
In a small bowl, add juice of one lime and salt. Stir.
Toss lime mixture with cabbage until well incorporated. Set aside for 10-15 minutes
Preheat grill to medium heat.
In a small bowl, add olive oil, ⅛ teaspoon salt and seafood spice blend. Stir.
Add prepared shrimp to a medium bowl. Toss shrimp with oil mixture, stirring as you go to lightly coat.
Sprinkle in ⅛ teaspoon salt and seafood spice blend.
Lightly oil grill grate. Cook shrimp for 2 to 3 minutes per side, or just until opaque and light grill marks appear. Transfer to a side plate.
Ready cabbage by pulling off layers one at a time. Rinse.
Prepare to assemble tacos. Layer in the following order or as you please: purple cabbage shell, cabbage slaw, cucumber, cilantro, 2-3 shrimp, microgreens.