question: What is a good beer pairing for Roast beef and horseradish sandwich?
answer: A great choice for Roast beef and horseradish sandwich is Hopped-Up Brown Ale - Prototype Challenge (Malt Hop Balance.). Here's the recipe:
  Brown ales are perfect foils for resinous C-Hops, as the piney elements of the latter contrast brilliantly with the sweeter, nutty elements of the malt bill. The best of both worlds.
  ABV: 6.3% | IBU: 85
  Malts:
  - Extra Pale (4 kilograms)
  - Flaked Oats (0.75 kilograms)
  - Brown (0.38 kilograms)
  - Crystal 150 (0.25 kilograms)
  - Munich (0.5 kilograms)
  - Carafa Special Malt Type 1 (0.06 kilograms)
  Hops:
  - Columbus (47grams @ start)
  - Simcoe (25grams @ end)
  - Centennial (25grams @ end)
  - Columbus (25grams @ dry hop)
  - Simcoe (37.5grams @ dry hop)
  - Citra (12.5grams @ FV)
  Yeast: Wyeast 1056 - American Ale™
  Method: Mash: 65°celsius for Nonemin
  Tip: High carbonate water will really accent the malt notes to better balance the punchy hops.