Simple and refreshing. In Germany, order a Radler and you will get a lemon-style soda mixed with the local brew, usually something akin to a lager. This might be Seven-up or Sprite, but for a real treat, try a high-quality lemonade. Better yet, search out a good recipe and try making your own. Then mix 1:1 with alcohol-free lager, or for more beer taste, mix three parts lager to one part soda/lemonade.