Caramelized Pineapple and Jalapeño Margaritas

Bahan-bahan (4 porsi)

• 1 1/4 cup granulated sugar, divided
• 1 jalapeño pepper, quartered, seeds removed
• 2 tablespoons butter
• 2 cups large fresh pineapple chunks, from 1 medium-sized pineapple
• Juice of 5 limes
• 2/3 cup tequila
• 3/4 cup triple sec
• 1 teaspoon vanilla extract