Shrimp:
Rinse the shrimp, then drain on a paper-towel-lined plate and pat dry (discard the tails if using jumbo shrimp). Season lightly with salt and as much po’ boy seasoning blend as you like.
In a large frying pan over medium-high heat, warm 1 to 2 tablespoons oil until hot but not smoking. Add the shrimp and cook, turning once, until firm and cooked through, 1 to 2 minutes per side for regular shrimp, 2 to 3 minutes per side for jumbo shrimp.
Scallops:
Rinse and drain the scallops, then drain on a paper-towel-lined plate and pat dry; season generously with salt and as much po’ boy seasoning blend as you like.
In a large frying pan over medium-high heat, warm 2 to 3 teaspoons oil until hot but not smoking. Add the scallops and cook without turning until golden brown on one side and starting to turn opaque, 2 to 4 minutes. Turn and continue cooking for about 30 seconds for translucent or 1 to 2 minutes for opaque.
Transfer the shellfish to a plate. Wipe out the pan.
While the shellfish cooks, prepare the garnishes.