Grilled Chicken Fajitas

Name: Grilled Chicken Fajitas
Ingredients: 3 limes; 1 tsp. ground coriander; 1/2 tsp. ground cumin; Pinch of cayenne; 4 tbsp. olive oil, divided; 1 lb. large peeled and deveined shrimp, tails discarded; 1 lb. boneless, skinless chicken breast, cut into 1 1/2-in. pieces; 1 lb. mixed-color peppers, cut into 1-in. pieces; 3 jalapeños, sliced 1/2 in. thick; 2 small red onions, cut into 1-in.-thick wedges; Kosher salt and pepper; 12 small flour tortillas; Sour cream, sliced radishes and chopped cilantro, for serving