Place pineapple ring on grill and char slightly on both sides. Remove from grill and cut into four chunks. In a cocktail shaker, muddle together fresh lime juice, Torani Lime Syrup, pineapple juice, and 3 chunks grilled pineapple. Add tequila, and ice; shake well. Strain into a rocks glass over ice. Garnish with remaining grilled pineapple chunk and a lime wheel.