Preparation Place pineapple chunks and red jalapeño slices in medium bowl. Press firmly on solids with muddler or back of wooden spoon until mashed. Mix in tequila, lime juice, Simple Syrup , and Cointreau, then 1 cup ice. Stir to blend well. Strain into large glass measuring cup. Divide remaining ice between 2 tall glasses. Pour Margarita mixture over.
Preparation Place pineapple chunks and red jalapeño slices in medium bowl. Press firmly on solids with muddler or back of wooden spoon until mashed. Mix in tequila, lime juice, Simple Syrup , and Cointreau, then 1 cup ice. Stir to blend well. Strain into large glass measuring cup. Divide remaining ice between 2 tall glasses. Pour Margarita mixture over.