Tequila has grown up. No longer a frat house or a blurry vacation cliché, Mexico's national spirit has returned in recent years to its roots, with new premium brands sprouting up that are perfect for sipping and stylish cocktails at home or on holiday. Here are 5 things you might not have known about Tequila – and a great recipe from our friends at Altos Tequila to get you in the 'spirit' for your next trip to Mexico.Mezcal or Tequila?It all starts...