Unlike the Washington landmark with which it shares a name, Hamburg’s famous White House is a cramped old fisherman’s cottage. That doesn’t keep eager diners away, and you’ll have to book well in advance for the privilege of submitting yourself to the whims of the kitchen, which, aside from catering to allergies and strong dislikes, sends out whatever it wants, basing meals on what looked good in the market that day. A Hamburg classic, aalsuppe (eel soup), often makes an appearance, followed by some creative seafood preparations, though the kitchen is just as comfortable with meat and even vegetarian meals.