To celebrate London Beer Week we asked Jonny from the Craft Beer Boys to show us how to make probably the best beer cocktail out there - the Lagerita. Putting a beery twist on the classic Margarita cocktail, it's a mix of tequila, lime juice, agave syrup and beer - in this case we used a super hoppy London beer - Camden Town Brewery's India Hells Lager or IHL.