Shrimp Tacos with Grapefruit Salad

Name: Shrimp Tacos with Grapefruit Salad
Ingredients: 3red grapefruits (2 segmented, 1 juiced); 1/2 small jicama, peeled and cut into matchsticks; 1/2 small red onion, thinly sliced; 1/2 cup fresh cilantro; Juice of 1 lime, plus wedges for serving; 2 tablespoons extra-virgin olive oil, plus more for the grill pan; Kosher salt and freshly ground pepper; 8 corn tortillas; 2 tablespoons agave syrup (or 1 tablespoon honey); 1 chipotle chile pepper in adobo sauce, chopped, plus 2 teaspoons sauce from the can; 1 teaspoon ground cumin; 1 pound large shrimp, peeled and deveined