question: What is a good beer pairing for Roast beef with a herb and malt crust?
answer: A great choice for Roast beef with a herb and malt crust is Paradox Islay 2018 (Whisky Cask Aged Imperial Stout.). Here's the recipe:
  Our longest running beer series, Paradox sees us ageing an Imperial Stout in different types of cask. This one showcases grain whisky.
  ABV: 13.5% | IBU: 100
  Malts:
  - Extra Pale (6.5 kilograms)
  - Flaked Oats (2 kilograms)
  - Caramalt (0.875 kilograms)
  - Dark Crystal (0.875 kilograms)
  - Munich (0.5 kilograms)
  - Carafa Special Malt Type 3 (0.5 kilograms)
  - Carafa Special Malt Type 1 (0.25 kilograms)
  Hops:
  - Columbus (60grams @ Start)
  - Columbus (20grams @ Middle)
  - Saaz (20grams @ End)
  - First Gold (20grams @ End)
  Yeast: Wyeast 1272 - American Ale II™
  Method: Mash: 65°celsius for 75min
  Tip: Brew this as part of a parti gyle mash, making this beer from your first runnings. It will take a long time to run off and be prepared to add dextrose to reach your target OG.