There is no menu at all. You either tell them which cocktail you would like from the classics (mojoto/margharita etc); or you tell them your preferences (which spirit you like, whether you like sweet or sour, long or short etc) and they create something amazing to your taste.

You won't get a cocktail class of the sort you're thinking of in Boadas. It's a proper old school bar and has changed very little over the years. No drinks menus, no food, just incredibly knowledgeable bar staff, (even if they do appear grumpy at times!) A place to order some proper cocktails, as they should be made. Ask for something obscure and watch them rise to the occasion.