Kevin and I made this last week. I know it's a hit when he takes a bite and says, "Oh, this is awful. I don't know how I'll be able to make myself eat it." We served it with lime-cilantro rice and a salad. There were no leftovers.
In a medium bowl, mix oil, half the jalapeno, half the garlic and lime zest; season with salt and pepper. Fold in shrimp. Cover and refrigerate for 15 minutes up to 1 hour.
In a shallow saucepan, comine 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.