Grilled Pineapple Margarita

Name: Grilled Pineapple Margarita
Prep time: 10 min
Cook time: 10 min
Total time: 20 min
Cuisine: Mexican
Ingredients: Vegetable oil (for greasing the grill); 1 pineapple (peeled, cored, and cut into 1/2-inch rings, crosswise); 1 jalapeño (chopped, or more to taste); 1/4 cup chopped cilantro leaves and upper stems; 3 cups pineapple juice; 1 cup white or silver tequila; 3/4 cup freshly squeezed lime juice; 1/2 cup agave syrup or simple syrup; 2 tablespoons kosher or coarse sea salt; 2 tablespoons ground piquín chile or Mexican dried ground chile; 1/2 cup turbinado or dark brown sugar