Sea scallops are dredged in flour, seasoned with a spicy blend of cayenne pepper, cumin, coriander, salt, and cardamom, then seared and served with shredded romaine on rounds of daikon.
Combine flour, cayenne pepper, cumin, coriander, salt, and cardamom in a small bowl. Dip each halved scallop into the flour mixture to coat; set aside.
Place daikon rounds on serving platter. Top each with shredded lettuce; set aside.
Heat a medium nonstick skillet over medium heat. Coat with olive-oil spray, add coated scallops, and sear until light golden brown and cooked through, about 1 minute per side. Transfer each seared scallop half to a daikon round. Serve warm or at room temperature.