Toss peeled and deveined shrimp with a simple, spicy marinade then grill until charred and cook through. Top this dinner entree with orange sauce—splashed with tequila—and you've got the makings for a fun, flavorful fiesta.
In a medium bowl, combine shrimp, oil, half the jalapeno, half the garlic, and zest; season with salt and pepper. Refrigerate, covered, for at least 15 minutes and up to 1 hour.
In a shallow saucepan, combine remaining jalapeno and garlic, 1 teaspoon salt, pepper, orange juice, tequila, and shallots; bring to a boil over medium-high heat. Cook until mixture is thick and syrupy, 7 to 8 minutes. Stir in butter; keep warm.
Heat a gas grill on high or stove-top grill pan over high heat. Grill shrimp, turning once, until just opaque, about 4 minutes. Transfer to a serving platter; pour tequila sauce over shrimp. Garnish with chives; serve immediately with lime wedges.